Final refactoring and implementation of delayed window deletion logic. Works worse now, but the changes are important and need to be checked in now

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4747 7fd9a85b-ad96-42d3-883c-3090e2eb8679

29 files changed, 602 insertions, 224 deletions

diff --git a/NxWidgets/UnitTests/nxwm/main.cxx b/NxWidgets/UnitTests/nxwm/main.cxx
index 6a2e952d85..86ea324d5d 100644
--- a/NxWidgets/UnitTests/nxwm/main.cxx
+++ b/NxWidgets/UnitTests/nxwm/main.cxx
@@ -46,10 +46,13 @@
 
 #include "ctaskbar.hxx"
 #include "cstartwindow.hxx"
-#include "ctouchscreen.hxx"
-#include "ccalibration.hxx"
 #include "cnxconsole.hxx"
 
+#ifdef CONFIG_NXWM_TOUCHSCREEN
+#  include "ctouchscreen.hxx"
+#  include "ccalibration.hxx"
+#endif
+
 /////////////////////////////////////////////////////////////////////////////
 // Pre-processor Definitions
 /////////////////////////////////////////////////////////////////////////////
@@ -67,10 +70,19 @@
 #ifdef CONFIG_HAVE_FILENAME
 #  define showTestStepMemory(msg) \
      _showTestStepMemory((FAR const char*)__FILE__, (int)__LINE__, msg)
-#  define showTestCaseMemory(msg) \
-     _showTestCaseMemory((FAR const char*)__FILE__, (int)__LINE__, msg)
-#  define showTestMemory(msg) \
-     _showTestMemory((FAR const char*)__FILE__, (int)__LINE__, msg)
+#endif
+
+#ifdef CONFIG_NXWIDGET_MEMMONITOR
+#  ifdef CONFIG_HAVE_FILENAME
+#    define showTestCaseMemory(msg) \
+       _showTestCaseMemory((FAR const char*)__FILE__, (int)__LINE__, msg)
+#    define showTestMemory(msg) \
+       _showTestMemory((FAR const char*)__FILE__, (int)__LINE__, msg)
+#  endif
+#else
+#    define initMemoryUsage()
+#    define showTestCaseMemory(msg)
+#    define showTestMemory(msg)
 #endif
 
 /////////////////////////////////////////////////////////////////////////////
@@ -85,9 +97,11 @@ struct SNxWmTest
   NxWM::CTouchscreen *touchscreen;         // The touchscreen
   struct NxWM::SCalibrationData calibData; // Calibration data
 #endif
+#ifdef CONFIG_NXWIDGET_MEMMONITOR
   unsigned int        mmInitial;           // Initial memory usage
   unsigned int        mmStep;              // Memory Usage at beginning of test step
   unsigned int        mmSubStep;           // Memory Usage at beginning of test sub-step
+#endif
 };
 
 /////////////////////////////////////////////////////////////////////////////
@@ -112,6 +126,7 @@ extern "C" int MAIN_NAME(int argc, char *argv[]);
 // Name: updateMemoryUsage
 /////////////////////////////////////////////////////////////////////////////
 
+#ifdef CONFIG_NXWIDGET_MEMMONITOR
 #ifdef CONFIG_HAVE_FILENAME
 static void updateMemoryUsage(unsigned int *previous,
                               FAR const char *file, int line,
@@ -145,11 +160,13 @@ static void updateMemoryUsage(unsigned int *previous,
 
   *previous =  mmcurrent.uordblks;
 }
+#endif
 
 /////////////////////////////////////////////////////////////////////////////
 // Name: showTestCaseMemory
 /////////////////////////////////////////////////////////////////////////////
 
+#ifdef CONFIG_NXWIDGET_MEMMONITOR
 #ifdef CONFIG_HAVE_FILENAME
 static void _showTestCaseMemory(FAR const char *file, int line, FAR const char *msg)
 {
@@ -163,11 +180,13 @@ static void showTestCaseMemory(FAR const char *msg)
   g_nxwmtest.mmSubStep = g_nxwmtest.mmInitial;
 }
 #endif
+#endif
 
 /////////////////////////////////////////////////////////////////////////////
 // Name: showTestMemory
 /////////////////////////////////////////////////////////////////////////////
 
+#ifdef CONFIG_NXWIDGET_MEMMONITOR
 #ifdef CONFIG_HAVE_FILENAME
 static void _showTestMemory(FAR const char *file, int line, FAR const char *msg)
 {
@@ -179,11 +198,13 @@ static void showTestMemory(FAR const char *msg)
   updateMemoryUsage(&g_nxwmtest.mmInitial, msg);
 }
 #endif
+#endif
 
 /////////////////////////////////////////////////////////////////////////////
 // Name: initMemoryUsage
 /////////////////////////////////////////////////////////////////////////////
 
+#ifdef CONFIG_NXWIDGET_MEMMONITOR
 static void initMemoryUsage(void)
 {
   struct mallinfo mmcurrent;
@@ -198,6 +219,7 @@ static void initMemoryUsage(void)
   g_nxwmtest.mmStep    = mmcurrent.uordblks;
   g_nxwmtest.mmSubStep = mmcurrent.uordblks;
 }
+#endif
 
 /////////////////////////////////////////////////////////////////////////////
 // Name: cleanup
@@ -361,7 +383,7 @@ static bool startWindowManager(void)
       return false;
     }
 
-  showTestCaseMemory("AstartWindowManager: fter starting the window manager");
+  showTestCaseMemory("startWindowManager: After starting the window manager");
   return true;
 }
 
@@ -497,12 +519,16 @@ static bool createNxConsole(void)
 #ifdef CONFIG_HAVE_FILENAME
 void _showTestStepMemory(FAR const char *file, int line, FAR const char *msg)
 {
+#ifdef CONFIG_NXWIDGET_MEMMONITOR
   updateMemoryUsage(&g_nxwmtest.mmSubStep, file, line, msg);
+#endif
 }
 #else
 void showTestStepMemory(FAR const char *msg)
 {
+#ifdef CONFIG_NXWIDGET_MEMMONITOR
   updateMemoryUsage(&g_nxwmtest.mmSubStep, msg);
+#endif
 }
 #endif
 
@@ -608,19 +634,23 @@ int MAIN_NAME(int argc, char *argv[])
     } 
 #endif
 
-  // Wait a little bit for the display to stabilize.  The simulation pressing of
+  // Wait a little bit for the display to stabilize.  Then simulate pressing of
   // the 'start window' icon in the task bar
 
 #ifndef CONFIG_NXWM_TOUCHSCREEN
   sleep(2);
-  g_nxwmtest.taskbar->clickIcon(0);
+  g_nxwmtest.taskbar->clickIcon(0, true);
+  usleep(500*1000);
+  g_nxwmtest.taskbar->clickIcon(0, false);
   showTestCaseMemory(MAIN_STRING "After clicking the start window icon");
 
-  // Wait bit to see the result of the button press.  The press the first icon
+  // Wait bit to see the result of the button press.  Then press the first icon
   // in the start menu.  That should be the NxConsole icon.
 
   sleep(2);
-  g_nxwmtest.startwindow->clickIcon(0);
+  g_nxwmtest.startwindow->clickIcon(0, true);
+  usleep(500*1000);
+  g_nxwmtest.startwindow->clickIcon(0, false);
   showTestCaseMemory(MAIN_STRING "After clicking the NxConsole icon");
 #endif
 
diff --git a/NxWidgets/libnxwidgets/include/ibitmap.hxx b/NxWidgets/libnxwidgets/include/ibitmap.hxx
index 5eaa5b3c95..923df407a8 100644
--- a/NxWidgets/libnxwidgets/include/ibitmap.hxx
+++ b/NxWidgets/libnxwidgets/include/ibitmap.hxx
@@ -103,6 +103,15 @@ namespace NXWidgets
   {
   public:
     /**
+     * A virtual destructor is required in order to override the IBitmap
+     * destructor.  We do this because if we delete IBitmap, we want the
+     * destructor of the class that inherits from IBitmap to run, not this
+     * one.
+     */
+
+    virtual ~IBitmap(void) { }
+
+    /**
      * Get the bitmap's color format.
      *
      * @return The bitmap's width.
diff --git a/NxWidgets/libnxwidgets/include/ilistbox.hxx b/NxWidgets/libnxwidgets/include/ilistbox.hxx
index 9184f23c81..0eb33bc3b4 100644
--- a/NxWidgets/libnxwidgets/include/ilistbox.hxx
+++ b/NxWidgets/libnxwidgets/include/ilistbox.hxx
@@ -102,6 +102,14 @@ namespace NXWidgets
   class IListBox
   {
   public:
+    /**
+     * A virtual destructor is required in order to override the IListBox
+     * destructor.  We do this because if we delete IListBox, we want the
+     * destructor of the class that inherits from IListBox to run, not this
+     * one.
+     */
+
+    virtual ~IListBox(void) { }
 
     /**
      * Add a new option to the widget using default colors.
diff --git a/NxWidgets/libnxwidgets/include/ilistdataeventhandler.hxx b/NxWidgets/libnxwidgets/include/ilistdataeventhandler.hxx
index b6119a2ae2..26bf1411b0 100644
--- a/NxWidgets/libnxwidgets/include/ilistdataeventhandler.hxx
+++ b/NxWidgets/libnxwidgets/include/ilistdataeventhandler.hxx
@@ -104,6 +104,15 @@ namespace NXWidgets
   {
   public:
     /**
+     * A virtual destructor is required in order to override the IListDataEventHandler
+     * destructor.  We do this because if we delete IListDataEventHandler, we want the
+     * destructor of the class that inherits from IListDataEventHandler to run, not this
+     * one.
+     */
+
+    virtual ~IListDataEventHandler(void) { }
+
+    /**
      * Handle data changes.
      *
      * @param e Event arguments.
diff --git a/NxWidgets/libnxwidgets/include/inxwindow.hxx b/NxWidgets/libnxwidgets/include/inxwindow.hxx
index c38052de02..750994a71b 100644
--- a/NxWidgets/libnxwidgets/include/inxwindow.hxx
+++ b/NxWidgets/libnxwidgets/include/inxwindow.hxx
@@ -79,6 +79,14 @@ namespace NXWidgets
   class INxWindow
   {
   public:
+    /**
+     * A virtual destructor is required in order to override the INxWindow
+     * destructor.  We do this because if we delete INxWindow, we want the
+     * destructor of the class that inherits from INxWindow to run, not this
+     * one.
+     */
+
+    virtual ~INxWindow(void) { }
 
     /**
      * Creates a new window.  Window creation is separate from
diff --git a/NxWidgets/libnxwidgets/include/iscrollable.hxx b/NxWidgets/libnxwidgets/include/iscrollable.hxx
index 21a69e487e..b0e65a9dbc 100644
--- a/NxWidgets/libnxwidgets/include/iscrollable.hxx
+++ b/NxWidgets/libnxwidgets/include/iscrollable.hxx
@@ -103,6 +103,15 @@ namespace NXWidgets
   {
   public:
     /**
+     * A virtual destructor is required in order to override the IScrollable
+     * destructor.  We do this because if we delete IScrollable, we want the
+     * destructor of the class that inherits from IScrollable to run, not this
+     * one.
+     */
+
+    virtual ~IScrollable(void) { }
+
+    /**
      * Gets the x coordinate of the virtual canvas.
      *
      * @return The x coordinate of the virtual canvas.
diff --git a/NxWidgets/libnxwidgets/include/islider.hxx b/NxWidgets/libnxwidgets/include/islider.hxx
index 5ea821e427..5a93409230 100644
--- a/NxWidgets/libnxwidgets/include/islider.hxx
+++ b/NxWidgets/libnxwidgets/include/islider.hxx
@@ -99,6 +99,14 @@ namespace NXWidgets
   class ISlider
   {
   public:
+    /**
+     * A virtual destructor is required in order to override the ISlider
+     * destructor.  We do this because if we delete ISlider, we want the
+     * destructor of the class that inherits from ISlider to run, not this
+     * one.
+     */
+
+    virtual ~ISlider(void) { }
 
     /**
      * Get the smallest value that the slider can represent.
diff --git a/NxWidgets/libnxwidgets/include/itextbox.hxx b/NxWidgets/libnxwidgets/include/itextbox.hxx
index 78de7e5029..0e2e7b824e 100644
--- a/NxWidgets/libnxwidgets/include/itextbox.hxx
+++ b/NxWidgets/libnxwidgets/include/itextbox.hxx
@@ -115,6 +115,14 @@ namespace NXWidgets
   class ITextBox
   {
   public:
+    /**
+     * A virtual destructor is required in order to override the ITextBox
+     * destructor.  We do this because if we delete ITextBox, we want the
+     * destructor of the class that inherits from ITextBox to run, not this
+     * one.
+     */
+
+    virtual ~ITextBox(void) { }
 
     /**
      * Sets the cursor display mode.
diff --git a/NxWidgets/libnxwidgets/src/ccallback.cxx b/NxWidgets/libnxwidgets/src/ccallback.cxx
index 09dc53a5aa..32c5b7d642 100644
--- a/NxWidgets/libnxwidgets/src/ccallback.cxx
+++ b/NxWidgets/libnxwidgets/src/ccallback.cxx
@@ -36,7 +36,7 @@
 /****************************************************************************
  * Included Files
  ****************************************************************************/
- 
+
 #include <nuttx/config.h>
 
 #include <sys/types.h>
diff --git a/NxWidgets/libnxwidgets/src/cnxwindow.cxx b/NxWidgets/libnxwidgets/src/cnxwindow.cxx
index 5993359721..5ba4d734c4 100644
--- a/NxWidgets/libnxwidgets/src/cnxwindow.cxx
+++ b/NxWidgets/libnxwidgets/src/cnxwindow.cxx
@@ -36,7 +36,7 @@
 /****************************************************************************
  * Included Files
  ****************************************************************************/
- 
+
 #include <nuttx/config.h>
 
 #include <stdint.h>
diff --git a/NxWidgets/nxwm/Makefile b/NxWidgets/nxwm/Makefile
index d951d11b26..b0b33c73d5 100644
--- a/NxWidgets/nxwm/Makefile
+++ b/NxWidgets/nxwm/Makefile
@@ -41,10 +41,16 @@ NXWIDGETDIR := $(NXWMDIR)/../libnxwidgets
 
 ASRCS =
 CSRCS =
+
+
 # Window Manager
-CXXSRCS  = capplicationwindow.cxx ccalibration.cxx cfullscreenwindow.cxx
-CXXSRCS += cnxconsole.cxx cstartwindow.cxx ctaskbar.cxx ctouchscreen.cxx
-CXXSRCS += cwindowcontrol.cxx
+CXXSRCS  = capplicationwindow.cxx cfullscreenwindow.cxx cnxconsole.cxx
+CXXSRCS += cstartwindow.cxx ctaskbar.cxx cwindowmessenger.cxx
+
+ifeq ($(CONFIG_NXWM_TOUCHSCREEN),y)
+CXXSRCS += ccalibration.cxx ctouchscreen.cxx
+endif
+
 # Images
 CXXSRCS += glyph_calibration.cxx glyph_cmd.cxx glyph_minimize.cxx glyph_nsh.cxx
 CXXSRCS += glyph_play.cxx glyph_start.cxx glyph_stop.cxx
diff --git a/NxWidgets/nxwm/doc/NxWM-ThreadingModel.ppt b/NxWidgets/nxwm/doc/NxWM-ThreadingModel.ppt
index 382f69dd84..b532eaa659 100644
--- a/NxWidgets/nxwm/doc/NxWM-ThreadingModel.ppt
+++ b/NxWidgets/nxwm/doc/NxWM-ThreadingModel.ppt
diff --git a/NxWidgets/nxwm/include/capplicationwindow.hxx b/NxWidgets/nxwm/include/capplicationwindow.hxx
index f923f28b48..686150d144 100644
--- a/NxWidgets/nxwm/include/capplicationwindow.hxx
+++ b/NxWidgets/nxwm/include/capplicationwindow.hxx
@@ -44,6 +44,7 @@
 
 #include "cnxtkwindow.hxx"
 #include "cnxtoolbar.hxx"
+#include "cwidgetcontrol.hxx"
 #include "cwidgeteventargs.hxx"
 #include "cwidgeteventhandler.hxx"
 #include "cimage.hxx"
@@ -151,12 +152,19 @@ namespace NxWM
     NXWidgets::INxWindow *getWindow(void) const;
 
     /**
-     * Recover the contained window control
+     * Recover the contained widget control
      *
-     * @return.  The window control used by this application
+     * @return.  The widget control used by this application
      */
 
-    CWindowControl *getWindowControl(void) const ;
+    NXWidgets::CWidgetControl *getWidgetControl(void) const;
+
+    /**
+     * Block further activity on this window in preparation for window
+     * shutdown.
+     */
+
+    void block(void);
 
     /**
      * Set the window label
@@ -195,21 +203,25 @@ namespace NxWM
     }
 
     /**
-     * Simulate a mouse click on the minimize icon.  This inline method is only
-     * used during automated testing of NxWM.
+     * Simulate a mouse click or release on the minimize icon.  This method
+     * is only available for automated testing of NxWM.
+     *
+     * @param click.  True to click; false to release;
      */
 
 #if defined(CONFIG_NXWM_UNITTEST) && !defined(CONFIG_NXWM_TOUCHSCREEN)
-    void clickMinimizeIcon(int index);
+    void clickMinimizePosition(bool click);
 #endif
 
     /**
-     * Simulate a mouse click on the stop applicaiton icon.  This inline method is only
-     * used during automated testing of NxWM.
+     * Simulate a mouse click or release on the stop icon.  This method
+     * is only available for automated testing of NxWM.
+     *
+     * @param click.  True to click; false to release;
      */
 
 #if defined(CONFIG_NXWM_UNITTEST) && !defined(CONFIG_NXWM_TOUCHSCREEN)
-    void clickStopIcon(int index);
+    void clickStopIcon(bool click);
 #endif
   };
 }
diff --git a/NxWidgets/nxwm/include/ccalibration.hxx b/NxWidgets/nxwm/include/ccalibration.hxx
index 55cef6d848..e9b5d400f3 100644
--- a/NxWidgets/nxwm/include/ccalibration.hxx
+++ b/NxWidgets/nxwm/include/ccalibration.hxx
@@ -52,6 +52,7 @@
 #include "ctaskbar.hxx"
 #include "iapplication.hxx"
 #include "cfullscreenwindow.hxx"
+#include "cwindowmessenger.hxx"
 
 /****************************************************************************
  * Pre-processor Definitions
@@ -143,6 +144,7 @@ namespace NxWM
      * CCalibration state data
      */
 
+    CWindowMessenger           m_messenger;       /**< Window event handler/messenger */
     CTaskbar                  *m_taskbar;         /**< The taskbar (used to terminate calibration) */
     CFullScreenWindow         *m_window;          /**< The window for the calibration display */
     CTouchscreen              *m_touchscreen;     /**< The touchscreen device */
@@ -290,6 +292,17 @@ namespace NxWM
     void stop(void);
 
     /**
+     * Destroy the application and free all of its resources.  This method
+     * will initiate blocking of messages from the NX server.  The server
+     * will flush the window message queue and reply with the blocked
+     * message.  When the block message is received by CWindowMessenger,
+     * it will send the destroy message to the start window task which
+     * will, finally, safely delete the application.
+     */
+
+    void destroy(void);
+
+    /**
      * The application window is hidden (either it is minimized or it is
      * maximized, but not at the top of the hierarchy
      */
diff --git a/NxWidgets/nxwm/include/cfullscreenwindow.hxx b/NxWidgets/nxwm/include/cfullscreenwindow.hxx
index 2e3fbd45d5..1bab37543f 100644
--- a/NxWidgets/nxwm/include/cfullscreenwindow.hxx
+++ b/NxWidgets/nxwm/include/cfullscreenwindow.hxx
@@ -43,6 +43,7 @@
 #include <nuttx/config.h>
 
 #include "cnxwindow.hxx"
+#include "cwidgetcontrol.hxx"
 
 #include "iapplicationwindow.hxx"
 
@@ -115,12 +116,19 @@ namespace NxWM
     NXWidgets::INxWindow *getWindow(void) const;
 
     /**
-     * Recover the contained window control
+     * Recover the contained widget control
      *
-     * @return.  The window control used by this application
+     * @return.  The widget control used by this application
      */
 
-    CWindowControl *getWindowControl(void) const;
+    NXWidgets::CWidgetControl *getWidgetControl(void) const;
+
+    /**
+     * Block further activity on this window in preparation for window
+     * shutdown.
+     */
+
+    void block(void);
 
     /**
      * Set the window label
@@ -147,21 +155,25 @@ namespace NxWM
     void registerCallbacks(IApplicationCallback *callback);
 
     /**
-     * Simulate a mouse click on the minimize icon.  This inline method is only
-     * used during automated testing of NxWM.
+     * Simulate a mouse click or release on the minimize icon.  This method
+     * is only available for automated testing of NxWM.
+     *
+     * @param click.  True to click; false to release;
      */
 
 #if defined(CONFIG_NXWM_UNITTEST) && !defined(CONFIG_NXWM_TOUCHSCREEN)
-    void clickMinimizeIcon(int index);
+    void clickMinimizePosition(bool click);
 #endif
 
     /**
-     * Simulate a mouse click on the stop applicaiton icon.  This inline method is only
-     * used during automated testing of NxWM.
+     * Simulate a mouse click or release on the stop icon.  This method
+     * is only available for automated testing of NxWM.
+     *
+     * @param click.  True to click; false to release;
      */
 
 #if defined(CONFIG_NXWM_UNITTEST) && !defined(CONFIG_NXWM_TOUCHSCREEN)
-    void clickStopIcon(int index);
+    void clickStopIcon(bool click);
 #endif
   };
 }
diff --git a/NxWidgets/nxwm/include/cnxconsole.hxx b/NxWidgets/nxwm/include/cnxconsole.hxx
index b95c86406c..bf3606f053 100644
--- a/NxWidgets/nxwm/include/cnxconsole.hxx
+++ b/NxWidgets/nxwm/include/cnxconsole.hxx
@@ -49,6 +49,7 @@
 #include "iapplication.hxx"
 #include "capplicationwindow.hxx"
 #include "ctaskbar.hxx"
+#include "cwindowmessenger.hxx"
 
 /****************************************************************************
  * Pre-Processor Definitions
@@ -78,10 +79,11 @@ namespace NxWM
   class CNxConsole : public IApplication, private IApplicationCallback
   {
   private:
-    CTaskbar            *m_taskbar;  /**< Reference to the "parent" taskbar */
-    CApplicationWindow  *m_window;   /**< Reference to the application window */
-    NXCONSOLE            m_nxcon;    /**< NxConsole handle */
-    pid_t                m_pid;      /**< Task ID of the NxConsole thread */
+    CWindowMessenger     m_messenger; /**< Window event handler/messenger */
+    CTaskbar            *m_taskbar;   /**< Reference to the "parent" taskbar */
+    CApplicationWindow  *m_window;    /**< Reference to the application window */
+    NXCONSOLE            m_nxcon;     /**< NxConsole handle */
+    pid_t                m_pid;       /**< Task ID of the NxConsole thread */
 
     /**
      * This is the NxConsole task.  This function first redirects output to the
@@ -167,6 +169,17 @@ namespace NxWM
     void stop(void);
 
     /**
+     * Destroy the application and free all of its resources.  This method
+     * will initiate blocking of messages from the NX server.  The server
+     * will flush the window message queue and reply with the blocked
+     * message.  When the block message is received by CWindowMessenger,
+     * it will send the destroy message to the start window task which
+     * will, finally, safely delete the application.
+     */
+
+    void destroy(void);
+
+    /**
      * The application window is hidden (either it is minimized or it is
      * maximized, but not at the top of the hierarchy
      */
diff --git a/NxWidgets/nxwm/include/cstartwindow.hxx b/NxWidgets/nxwm/include/cstartwindow.hxx
index 8b5fd92d36..3a5325cb75 100644
--- a/NxWidgets/nxwm/include/cstartwindow.hxx
+++ b/NxWidgets/nxwm/include/cstartwindow.hxx
@@ -48,6 +48,7 @@
 
 #include "iapplication.hxx"
 #include "capplicationwindow.hxx"
+#include "cwindowmessenger.hxx"
 
 /****************************************************************************
  * Pre-Processor Definitions
@@ -115,11 +116,12 @@ namespace NxWM
      * CStartWindow state data
      */
 
-    CTaskbar                         *m_taskbar;  /**< Reference to the "parent" taskbar */
-    CApplicationWindow               *m_window;   /**< Reference to the application window */
-    TNxArray<struct SStartWindowSlot> m_slots;    /**< List of apps in the start window */
-    struct nxgl_size_s                m_iconSize; /**< A box big enough to hold the largest icon */
-    pid_t                             m_taskId;   /**< ID of the start window task */
+    CWindowMessenger                  m_messenger; /**< Window event handler/messenger */
+    CTaskbar                         *m_taskbar;   /**< Reference to the "parent" taskbar */
+    CApplicationWindow               *m_window;    /**< Reference to the application window */
+    TNxArray<struct SStartWindowSlot> m_slots;     /**< List of apps in the start window */
+    struct nxgl_size_s                m_iconSize;  /**< A box big enough to hold the largest icon */
+    pid_t                             m_taskId;    /**< ID of the start window task */
 
     /**
      * This is the start window task.  This function receives window events from
@@ -138,8 +140,8 @@ namespace NxWM
      * 4. NXWidgets::CWidgetControl records the new state data and raises a
      *    window event.
      * 5. NXWidgets::CWindowEventHandlerList will give the event to
-     *    NxWM::CWindowControl.
-     * 6. NxWM::CWindowControl will send the a message on a well-known message
+     *    NxWM::CWindowMessenger.
+     * 6. NxWM::CWindowMessenger will send the a message on a well-known message
      *    queue.
      * 7. This CStartWindow::startWindow task will receive and process that
      *    message.
@@ -236,6 +238,17 @@ namespace NxWM
     void stop(void);
 
     /**
+     * Destroy the application and free all of its resources.  This method
+     * will initiate blocking of messages from the NX server.  The server
+     * will flush the window message queue and reply with the blocked
+     * message.  When the block message is received by CWindowMessenger,
+     * it will send the destroy message to the start window task which
+     * will, finally, safely delete the application.
+     */
+
+    void destroy(void);
+
+    /**
      * The application window is hidden (either it is minimized or it is
      * maximized, but not at the top of the hierarchy)
      */
@@ -275,32 +288,15 @@ namespace NxWM
     bool addApplication(IApplicationFactory *app);
 
     /**
-     * Simulate a mouse click on the icon at index.  This inline method is only
-     * used during automated testing of NxWM.
+     * Simulate a mouse click or release on the icon at index.  This method
+     * is only available during automated testing of NxWM.
+     *
+     * @param index.  Selects the icon in the start window
+     * @param click.  True to click and false to release
      */
 
 #if defined(CONFIG_NXWM_UNITTEST) && !defined(CONFIG_NXWM_TOUCHSCREEN)
-    inline void clickIcon(int index)
-    {
-      if (index < m_slots.size())
-       {
-         // Get the image widget at this index
-
-         NXWidgets::CImage *image = m_slots.at(index).image;
-
-         // Get the size and position of the widget
-
-         struct nxgl_size_s imageSize;
-         image->getSize(imageSize);
-
-         struct nxgl_point_s imagePos;
-         image->getPos(imagePos);
-
-         // And click the image at its center
-
-         image->click(imagePos.x + (imageSize.w >> 1), imagePos.y + (imageSize.h >> 1));
-       }
-    }
+    void clickIcon(int index, bool click);
 #endif
   };
 }
diff --git a/NxWidgets/nxwm/include/ctaskbar.hxx b/NxWidgets/nxwm/include/ctaskbar.hxx
index cf98d10d9f..a78fb17394 100644
--- a/NxWidgets/nxwm/include/ctaskbar.hxx
+++ b/NxWidgets/nxwm/include/ctaskbar.hxx
@@ -110,12 +110,12 @@ namespace NxWM
     /**
      * Create a raw window. 
      *
-     * 1) Create a dumb CWindowControl instance
-     * 2) Pass the dumb CWindowControl instance to the window constructor
-     *    that inherits from INxWindow.  This will "smarten" the CWindowControl
+     * 1) Create a dumb NXWidgets::CWidgetControl instance
+     * 2) Pass the dumb NXWidgets::CWidgetControl instance to the window constructor
+     *    that inherits from INxWindow.  This will "smarten" the NXWidgets::CWidgetControl
      *    instance with some window knowlede
      * 3) Call the open() method on the window to display the window.
-     * 4) After that, the fully smartened CWindowControl instance can
+     * 4) After that, the fully smartened NXWidgets::CWidgetControl instance can
      *    be used to generate additional widgets by passing it to the
      *    widget constructor
      */
@@ -398,32 +398,15 @@ namespace NxWM
     void getDisplaySize(FAR struct nxgl_size_s &size);
      
     /**
-     * Simulate a mouse click on the icon at index.  This inline method is only
-     * used during automated testing of NxWM.
+     * Simulate a mouse click or release on the icon at index.  This method
+     * is only available during automated testing of NxWM.
+     *
+     * @param index.  Selects the icon in the start window
+     * @param click.  True to click and false to release
      */
 
 #if defined(CONFIG_NXWM_UNITTEST) && !defined(CONFIG_NXWM_TOUCHSCREEN)
-    inline void clickIcon(int index)
-    {
-      if (index < m_slots.size())
-       {
-         // Get the image widget at this index
-
-         NXWidgets::CImage *image = m_slots.at(index).image;
-
-         // Get the size and position of the widget
-
-         struct nxgl_size_s imageSize;
-         image->getSize(imageSize);
-
-         struct nxgl_point_s imagePos;
-         image->getPos(imagePos);
-
-         // And click the image at its center
-
-         image->click(imagePos.x + (imageSize.w >> 1), imagePos.y + (imageSize.h >> 1));
-       }
-    }
+    void clickIcon(int index, bool click);
 #endif
   };
 }
diff --git a/NxWidgets/nxwm/include/cwindowcontrol.hxx b/NxWidgets/nxwm/include/cwindowmessenger.hxx
index 91e430c5c0..645e750cb1 100644
--- a/NxWidgets/nxwm/include/cwindowcontrol.hxx
+++ b/NxWidgets/nxwm/include/cwindowmessenger.hxx
@@ -1,5 +1,5 @@
 /****************************************************************************
- * NxWidgets/nxwm/include/cwindowcontrol.hxx
+ * NxWidgets/nxwm/include/cwindowmessenger.hxx
  *
  *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
@@ -33,8 +33,8 @@
  *
  ****************************************************************************/
 
-#ifndef __INCLUDE_CWINDOWCONTROL_HXX
-#define __INCLUDE_CWINDOWCONTROL_HXX
+#ifndef __INCLUDE_CWINDOWMESSENGER_HXX
+#define __INCLUDE_CWINDOWMESSENGER_HXX
 
 /****************************************************************************
  * Included Files
@@ -70,12 +70,11 @@ namespace NxWM
   class IApplication;
 
   /**
-   * The class CWindowControl integrates the widget control with some special
+   * The class CWindowMessenger integrates the widget control with some special
    * handling of mouse and keyboard inputs neesed by NxWM
    */
 
-  class CWindowControl : public NXWidgets::CWidgetControl,
-                         private NXWidgets::CWindowEventHandler
+  class CWindowMessenger : public NXWidgets::CWindowEventHandler
   {
   private:
     mqd_t m_mqd; /**< Message queue descriptor used to commincate with the
@@ -102,24 +101,20 @@ namespace NxWM
   public:
 
     /**
-     * Constructor
-     *
-     * @param style The default style that all widgets on this display
-     *   should use.  If this is not specified, the widget will use the
-     *   values stored in the defaultCWidgetStyle object.
+     * CWindowMessenger Constructor
      */
 
-     CWindowControl(FAR const NXWidgets::CWidgetStyle *style = (const NXWidgets::CWidgetStyle *)NULL);
+     CWindowMessenger(void);
 
     /**
-     * Destructor.
+     * CWindowMessenger Destructor.
      */
 
-    ~CWindowControl(void);
+    ~CWindowMessenger(void);
 
     /**
      * Destroy the application window and everything in it.  This is
-     * handled by CWindowControl (vs just calling the destructors) because
+     * handled by CWindowMessenger (vs just calling the destructors) because
      * in the case where an application destroys itself (because of pressing
      * the stop button), then we need to unwind and get out of the application
      * logic before destroying all of its objects.
@@ -130,4 +125,4 @@ namespace NxWM
 }
 #endif // __cplusplus
 
-#endif // __INCLUDE_CWINDOWCONTROL_HXX
+#endif // __INCLUDE_CWINDOWMESSENGER_HXX
diff --git a/NxWidgets/nxwm/include/iapplication.hxx b/NxWidgets/nxwm/include/iapplication.hxx
index 45067d900a..28e50e0136 100644
--- a/NxWidgets/nxwm/include/iapplication.hxx
+++ b/NxWidgets/nxwm/include/iapplication.hxx
@@ -45,8 +45,7 @@
 #include "cnxstring.hxx"
 #include "ibitmap.hxx"
 
-#include "cwindowcontrol.hxx"
-#include "capplicationwindow.hxx"
+#include "iapplicationwindow.hxx"
 
 /****************************************************************************
  * Pre-Processor Definitions
@@ -94,18 +93,6 @@ namespace NxWM
       virtual IApplicationWindow *getWindow(void) const = 0;
 
       /**
-       * Get the window widget control.
-       *
-       * @return The widget control of the underlying window instance.
-       */
-
-      virtual inline CWindowControl *getWindowControl(void) const
-      {
-        IApplicationWindow *window = getWindow();
-        return window->getWindowControl();
-      }
-
-      /**
        * Get the icon associated with the application
        *
        * @return An instance if IBitmap that may be used to rend the
@@ -132,12 +119,24 @@ namespace NxWM
       virtual bool run(void) = 0;
 
       /**
-       * Stop the application.
+       * Stop the application, put all widgets in a deactivated/disabled state
+       * and wait to see what happens next.
        */
 
       virtual void stop(void) = 0;
 
       /**
+       * Destroy the application and free all of its resources.  This method
+       * will initiate blocking of messages from the NX server.  The server
+       * will flush the window message queue and reply with the blocked
+       * message.  When the block message is received by CWindowMessenger,
+       * it will send the destroy message to the start window task which
+       * will, finally, safely delete the application.
+       */
+
+      virtual void destroy(void) = 0;
+
+      /**
        * The application window is hidden (either it is minimized or it is
        * maximized, but not at the top of the hierarchy
        */
diff --git a/NxWidgets/nxwm/include/iapplicationwindow.hxx b/NxWidgets/nxwm/include/iapplicationwindow.hxx
index fe8830c2fa..ed221797d4 100644
--- a/NxWidgets/nxwm/include/iapplicationwindow.hxx
+++ b/NxWidgets/nxwm/include/iapplicationwindow.hxx
@@ -44,8 +44,7 @@
 
 #include "inxwindow.hxx"
 #include "cnxstring.hxx"
-
-#include "cwindowcontrol.hxx"
+#include "cwidgetcontrol.hxx"
 
 /****************************************************************************
  * Pre-Processor Definitions
@@ -89,6 +88,15 @@ namespace NxWM
   {
   public:
     /**
+     * A virtual destructor is required in order to override the IApplicationWindow
+     * destructor.  We do this because if we delete IApplicationWindow, we want the
+     * destructor of the class that inherits from IApplicationWindow to run, not this
+     * one.
+     */
+
+      virtual ~IApplicationWindow(void) { }
+
+    /**
      * Initialize window.  Window initialization is separate from
      * object instantiation so that failures can be reported.
      *
@@ -119,12 +127,19 @@ namespace NxWM
     virtual NXWidgets::INxWindow *getWindow(void) const = 0;
 
     /**
-     * Recover the contained window control
+     * Recover the contained widget control
      *
-     * @return.  The window control used by this application
+     * @return.  The widget control used by this application
      */
 
-    virtual CWindowControl *getWindowControl(void) const = 0;
+    virtual NXWidgets::CWidgetControl *getWidgetControl(void) const = 0;
+
+    /**
+     * Block further activity on this window in preparation for window
+     * shutdown.
+     */
+
+    virtual void block(void) = 0;
 
     /**
      * Set the window label
@@ -151,21 +166,25 @@ namespace NxWM
     virtual void registerCallbacks(IApplicationCallback *callback) = 0;
 
     /**
-     * Simulate a mouse click on the minimize icon.  This inline method is only
-     * used during automated testing of NxWM.
+     * Simulate a mouse click or release on the minimize icon.  This method
+     * is only available for automated testing of NxWM.
+     *
+     * @param click.  True to click; false to release;
      */
 
 #if defined(CONFIG_NXWM_UNITTEST) && !defined(CONFIG_NXWM_TOUCHSCREEN)
-    virtual void clickMinimizeIcon(int index) = 0;
+    virtual void clickMinimizePosition(bool click) = 0;
 #endif
 
     /**
-     * Simulate a mouse click on the stop applicaiton icon.  This inline method is only
-     * used during automated testing of NxWM.
+     * Simulate a mouse click or release on the stop icon.  This method
+     * is only available for automated testing of NxWM.
+     *
+     * @param click.  True to click; false to release;
      */
 
 #if defined(CONFIG_NXWM_UNITTEST) && !defined(CONFIG_NXWM_TOUCHSCREEN)
-    virtual void clickStopIcon(int index) = 0;
+    virtual void clickStopIcon(bool click) = 0;
 #endif
   };
 }
diff --git a/NxWidgets/nxwm/include/nxwmconfig.hxx b/NxWidgets/nxwm/include/nxwmconfig.hxx
index 3605f8c4fc..25a8beb662 100644
--- a/NxWidgets/nxwm/include/nxwmconfig.hxx
+++ b/NxWidgets/nxwm/include/nxwmconfig.hxx
@@ -264,7 +264,7 @@
  * CONFIG_NXWM_STARTWINDOW_HSPACING - Horizontal spacing.  Default: 2 rows
  * CONFIG_NXWM_STARTWINDOW_ICON - The glyph to use as the start window icon
  * CONFIG_NXWM_STARTWINDOW_MQNAME - The well known name of the message queue
- *   Used to communicated from CWindowControl tothe start window thread. 
+ *   Used to communicated from CWindowMessenger to the start window thread. 
  *   Default: "/dev/nxwm"
  * CONFIG_NXWM_STARTWINDOW_MXMSGS - The maximum number of messages to queue
  *   before blocking.  Defualt 32
diff --git a/NxWidgets/nxwm/src/capplicationwindow.cxx b/NxWidgets/nxwm/src/capplicationwindow.cxx
index 15d4a4a9d0..c0bc9ed62c 100644
--- a/NxWidgets/nxwm/src/capplicationwindow.cxx
+++ b/NxWidgets/nxwm/src/capplicationwindow.cxx
@@ -47,7 +47,6 @@
 
 #include "nxwmconfig.hxx"
 #include "nxwmglyphs.hxx"
-#include "cwindowcontrol.hxx"
 #include "capplicationwindow.hxx"
 
 /********************************************************************************************
@@ -153,9 +152,9 @@ CApplicationWindow::~CApplicationWindow(void)
 
 bool CApplicationWindow::open(void)
 {
-  // Create one of our special window controls for the tool bar
+  // Create a widget control for the tool bar
 
-  CWindowControl *control = new CWindowControl();
+  NXWidgets::CWidgetControl *control = new NXWidgets::CWidgetControl();
   if (!control)
     {
       return false;
@@ -414,15 +413,31 @@ NXWidgets::INxWindow *CApplicationWindow::getWindow(void) const
 }
 
 /**
- * Recover the contained window control
+ * Recover the contained widget control
  *
- * @return.  The window control used by this application
+ * @return.  The widget control used by this application
  */
 
-CWindowControl *CApplicationWindow::getWindowControl(void) const
+NXWidgets::CWidgetControl *CApplicationWindow::getWidgetControl(void) const
 {
+  return m_window->getWidgetControl();
+}
+
+/**
+ * Block further activity on this window in preparation for window
+ * shutdown.
+ */
+
+void CApplicationWindow::block(void)
+{
+  // Get the widget control from the NXWidgets::CNxWindow instance
+
   NXWidgets::CWidgetControl *control = m_window->getWidgetControl();
-  return static_cast<CWindowControl*>(control);
+
+  // And then block further reporting activity on the underlying
+  // NX framed window
+
+  nxtk_block(control->getWindowHandle());
 }
 
 /**
@@ -459,12 +474,14 @@ void CApplicationWindow::registerCallbacks(IApplicationCallback *callback)
 }
 
 /**
- * Simulate a mouse click on the minimize icon.  This method is only
- * used during automated testing of NxWM.
+ * Simulate a mouse click or release on the minimize icon.  This method
+ * is only available for automated testing of NxWM.
+ *
+ * @param click.  True to click; false to release;
  */
 
 #if defined(CONFIG_NXWM_UNITTEST) && !defined(CONFIG_NXWM_TOUCHSCREEN)
-void CApplicationWindow::clickMinimizeIcon(int index)
+void CApplicationWindow::clickMinimizePosition(bool click)
 {
   // Get the size and position of the widget
 
@@ -474,20 +491,30 @@ void CApplicationWindow::clickMinimizeIcon(int index)
   struct nxgl_point_s imagePos;
   m_minimizeImage->getPos(imagePos);
 
-  // And click the image at its center
+  // And click or release the image at its center
 
-  m_minimizeImage->click(imagePos.x + (imageSize.w >> 1),
-                         imagePos.y + (imageSize.h >> 1));
+  if (click)
+    {
+      m_minimizeImage->click(imagePos.x + (imageSize.w >> 1),
+                             imagePos.y + (imageSize.h >> 1));
+    }
+  else
+    {
+      m_minimizeImage->release(imagePos.x + (imageSize.w >> 1),
+                               imagePos.y + (imageSize.h >> 1));
+    }
 }
 #endif
 
 /**
- * Simulate a mouse click on the stop applicaiton icon.  This method is only
- * used during automated testing of NxWM.
+ * Simulate a mouse click or release on the stop icon.  This method
+ * is only available for automated testing of NxWM.
+ *
+ * @param click.  True to click; false to release;
  */
 
 #if defined(CONFIG_NXWM_UNITTEST) && !defined(CONFIG_NXWM_TOUCHSCREEN)
-void CApplicationWindow::clickStopIcon(int index)
+void CApplicationWindow::clickStopIcon(bool click)
 {
   // The stop icon will not be available for "persistent" applications
 
@@ -501,10 +528,18 @@ void CApplicationWindow::clickStopIcon(int index)
       struct nxgl_point_s imagePos;
       m_stopImage->getPos(imagePos);
 
-      // And click the image at its center
+      // And click or release the image at its center
 
-      m_stopImage->click(imagePos.x + (imageSize.w >> 1),
-                         imagePos.y + (imageSize.h >> 1));
+      if (click)
+        {
+          m_stopImage->click(imagePos.x + (imageSize.w >> 1),
+                             imagePos.y + (imageSize.h >> 1));
+        }
+      else
+        {
+          m_stopImage->release(imagePos.x + (imageSize.w >> 1),
+                               imagePos.y + (imageSize.h >> 1));
+        }
     }
 }
 #endif
diff --git a/NxWidgets/nxwm/src/ccalibration.cxx b/NxWidgets/nxwm/src/ccalibration.cxx
index 248aca8389..d93f56a47a 100644
--- a/NxWidgets/nxwm/src/ccalibration.cxx
+++ b/NxWidgets/nxwm/src/ccalibration.cxx
@@ -99,6 +99,11 @@ CCalibration::CCalibration(CTaskbar *taskbar, CFullScreenWindow *window,
   m_calthread     = CALTHREAD_NOTRUNNING;
   m_calphase      = CALPHASE_NOT_STARTED;
   m_touched       = false;
+
+  // Add our messenger as the window callback
+
+  NXWidgets::CWidgetControl *control =  window->getWidgetControl();
+  control->addWindowEventHandler(&m_messenger);
 }
 
 /**
@@ -112,6 +117,11 @@ CCalibration::~CCalibration(void)
 
   stop();
 
+  // Remove ourself from the window callback
+
+  NXWidgets::CWidgetControl *control =  m_window->getWidgetControl();
+  control->removeWindowEventHandler(&m_messenger);
+
   // Although we did not create the window, the rule is that I have to dispose
   // of it
 
@@ -200,6 +210,26 @@ void CCalibration::stop(void)
 }
 
 /**
+ * Destroy the application and free all of its resources.  This method
+ * will initiate blocking of messages from the NX server.  The server
+ * will flush the window message queue and reply with the blocked
+ * message.  When the block message is received by CWindowMessenger,
+ * it will send the destroy message to the start window task which
+ * will, finally, safely delete the application.
+ */
+
+void CCalibration::destroy(void)
+{
+  // Block any further window messages
+
+  m_window->block();
+
+  // Make sure that the application is stopped
+
+  stop();
+}
+
+/**
  * The application window is hidden (either it is minimized or it is
  * maximized, but it is not at the top of the hierarchy)
  */
diff --git a/NxWidgets/nxwm/src/cfullscreenwindow.cxx b/NxWidgets/nxwm/src/cfullscreenwindow.cxx
index 40647d8e90..0c34166c06 100644
--- a/NxWidgets/nxwm/src/cfullscreenwindow.cxx
+++ b/NxWidgets/nxwm/src/cfullscreenwindow.cxx
@@ -128,15 +128,31 @@ NXWidgets::INxWindow *CFullScreenWindow::getWindow(void) const
 }
 
 /**
- * Recover the contained window control
+ * Recover the contained widget control
  *
- * @return.  The window control used by this application
+ * @return.  The widget control used by this application
  */
 
-CWindowControl *CFullScreenWindow::getWindowControl(void) const
+NXWidgets::CWidgetControl *CFullScreenWindow::getWidgetControl(void) const
 {
+  return m_window->getWidgetControl();
+}
+
+/**
+ * Block further activity on this window in preparation for window
+ * shutdown.
+ */
+
+void CFullScreenWindow::block(void)
+{
+  // Get the widget control from the NXWidgets::CNxWindow instance
+
   NXWidgets::CWidgetControl *control = m_window->getWidgetControl();
-  return static_cast<CWindowControl*>(control);
+
+  // And then block further reporting activity on the underlying
+  // NX raw window
+
+  nx_block(control->getWindowHandle());
 }
 
 /**
@@ -171,23 +187,27 @@ void CFullScreenWindow::registerCallbacks(IApplicationCallback *callback)
 }
 
 /**
- * Simulate a mouse click on the minimize icon.  This method is only
- * used during automated testing of NxWM.
+ * Simulate a mouse click or release on the minimize icon.  This method
+ * is only available for automated testing of NxWM.
+ *
+ * @param click.  True to click; false to release;
  */
 
 #if defined(CONFIG_NXWM_UNITTEST) && !defined(CONFIG_NXWM_TOUCHSCREEN)
-void CFullScreenWindow::clickMinimizeIcon(int index)
+void CFullScreenWindow::clickMinimizePosition(bool click)
 {
 }
 #endif
 
 /**
- * Simulate a mouse click on the stop applicaiton icon.  This method is only
- * used during automated testing of NxWM.
+ * Simulate a mouse click or release on the stop icon.  This method
+ * is only available for automated testing of NxWM.
+ *
+ * @param click.  True to click; false to release;
  */
 
 #if defined(CONFIG_NXWM_UNITTEST) && !defined(CONFIG_NXWM_TOUCHSCREEN)
-void CFullScreenWindow::clickStopIcon(int index)
+void CFullScreenWindow::clickStopIcon(bool click)
 {
 }
 #endif
diff --git a/NxWidgets/nxwm/src/cnxconsole.cxx b/NxWidgets/nxwm/src/cnxconsole.cxx
index 577bf661e0..64321ddfbf 100644
--- a/NxWidgets/nxwm/src/cnxconsole.cxx
+++ b/NxWidgets/nxwm/src/cnxconsole.cxx
@@ -129,9 +129,14 @@ CNxConsole::CNxConsole(CTaskbar *taskbar, CApplicationWindow *window)
   NXWidgets::CNxString myName = getName();
   window->setWindowLabel(myName);
 
-  // Add our callbacks to the application window
+  // Add our callbacks with the application window
 
   window->registerCallbacks(static_cast<IApplicationCallback *>(this));
+
+  // Add our messenger as the window callback
+
+  NXWidgets::CWidgetControl *control =  window->getWidgetControl();
+  control->addWindowEventHandler(&m_messenger);
 }
 
 /**
@@ -147,13 +152,15 @@ CNxConsole::~CNxConsole(void)
 
   stop();
 
+  // Remove ourself from the window callback
+
+  NXWidgets::CWidgetControl *control =  m_window->getWidgetControl();
+  control->removeWindowEventHandler(&m_messenger);
+
   // Although we didn't create it, we are responsible for deleting the
   // application window
 
-  if (m_window)
-    {
-      delete m_window;
-    }
+  delete m_window;
 }
 
 /**
@@ -322,6 +329,26 @@ void CNxConsole::stop(void)
 }
 
 /**
+ * Destroy the application and free all of its resources.  This method
+ * will initiate blocking of messages from the NX server.  The server
+ * will flush the window message queue and reply with the blocked
+ * message.  When the block message is received by CWindowMessenger,
+ * it will send the destroy message to the start window task which
+ * will, finally, safely delete the application.
+ */
+
+void CNxConsole::destroy(void)
+{
+  // Block any further window messages
+
+  m_window->block();
+
+  // Make sure that the application is stopped
+
+  stop();
+}
+
+/**
  * The application window is hidden (either it is minimized or it is
  * maximized, but not at the top of the hierarchy
  */
diff --git a/NxWidgets/nxwm/src/cstartwindow.cxx b/NxWidgets/nxwm/src/cstartwindow.cxx
index 2b7ecbe66d..3dfab50975 100644
--- a/NxWidgets/nxwm/src/cstartwindow.cxx
+++ b/NxWidgets/nxwm/src/cstartwindow.cxx
@@ -99,6 +99,11 @@ CStartWindow::CStartWindow(CTaskbar *taskbar, CApplicationWindow *window)
   // Add our callbacks to the application window
 
   window->registerCallbacks(static_cast<IApplicationCallback *>(this));
+
+  // Add our messenger as the window callback
+
+  NXWidgets::CWidgetControl *control =  window->getWidgetControl();
+  control->addWindowEventHandler(&m_messenger);
 }
 
 /**
@@ -112,13 +117,15 @@ CStartWindow::~CStartWindow(void)
 
   stop();
 
+  // Remove ourself from the window callback
+
+  NXWidgets::CWidgetControl *control =  m_window->getWidgetControl();
+  control->removeWindowEventHandler(&m_messenger);
+
   // Although we didn't create it, we are responsible for deleting the
   // application window
 
-  if (m_window)
-    {
-      delete m_window;
-    }
+  delete m_window;
 
   // Then stop and delete all applications
 
@@ -211,6 +218,28 @@ void CStartWindow::stop(void)
       task_delete(pid);
     }
 }
+/**
+ * Destroy the application and free all of its resources.  This method
+ * will initiate blocking of messages from the NX server.  The server
+ * will flush the window message queue and reply with the blocked
+ * message.  When the block message is received by CWindowMessenger,
+ * it will send the destroy message to the start window task which
+ * will, finally, safely delete the application.
+ */
+
+void CStartWindow::destroy(void)
+{
+  // What are we doing?  This should never happen because the start
+  // window task is persistent!
+
+  // Block any further window messages
+
+  m_window->block();
+
+  // Make sure that the application is stopped
+
+  stop();
+}
 
 /**
  * The application window is hidden (either it is minimized or it is
@@ -405,6 +434,47 @@ bool CStartWindow::addApplication(IApplicationFactory *app)
 }
 
 /**
+ * Simulate a mouse click or release on the icon at index.  This method
+ * is only available during automated testing of NxWM.
+ *
+ * @param index.  Selects the icon in the start window
+ * @param click.  True to click and false to release
+ */
+
+#if defined(CONFIG_NXWM_UNITTEST) && !defined(CONFIG_NXWM_TOUCHSCREEN)
+void CStartWindow::clickIcon(int index, bool click)
+{
+  if (index < m_slots.size())
+   {
+      // Get the image widget at this index
+
+      NXWidgets::CImage *image = m_slots.at(index).image;
+
+      // Get the size and position of the widget
+
+      struct nxgl_size_s imageSize;
+      image->getSize(imageSize);
+
+      struct nxgl_point_s imagePos;
+      image->getPos(imagePos);
+
+      // And click or release the image at its center
+
+      if (click)
+        {
+          image->click(imagePos.x + (imageSize.w >> 1),
+                       imagePos.y + (imageSize.h >> 1));
+        }
+      else
+        {
+          image->release(imagePos.x + (imageSize.w >> 1),
+                         imagePos.y + (imageSize.h >> 1));
+        }
+    }
+}
+#endif
+
+/**
  * Called when the window minimize button is pressed.
  */
 
@@ -523,11 +593,11 @@ void CStartWindow::handleActionEvent(const NXWidgets::CWidgetEventArgs &e)
                 }
               else
                 {
-                  // If we cannot start the app.  Destroy the
-                  // instance we created and see what happens next.
+                  // If we cannot start the app.  Destroy the instance we
+                  // created and see what happens next.  Could be interesting.
 
-                  CWindowControl *control = app->getWindowControl();
-                  control->destroy(app);
+                  app->stop();
+                  app->destroy();
                 }
             }
         }
@@ -548,8 +618,8 @@ void CStartWindow::handleActionEvent(const NXWidgets::CWidgetEventArgs &e)
  * 4. NXWidgets::CWidgetControl records the new state data and raises a
  *    window event.
  * 5. NXWidgets::CWindowEventHandlerList will give the event to
- *    NxWM::CWindowControl.
- * 6. NxWM::CWindowControl will send the a message on a well-known message
+ *    NxWM::CWindowMessenger.
+ * 6. NxWM::CWindowMessenger will send the a message on a well-known message
  *    queue.
  * 7. This CStartWindow::startWindow task will receive and process that
  *    message.
diff --git a/NxWidgets/nxwm/src/ctaskbar.cxx b/NxWidgets/nxwm/src/ctaskbar.cxx
index ab686f81cc..b4df0bb862 100644
--- a/NxWidgets/nxwm/src/ctaskbar.cxx
+++ b/NxWidgets/nxwm/src/ctaskbar.cxx
@@ -47,7 +47,6 @@
 #include "cwidgetcontrol.hxx"
 #include "cnxtkwindow.hxx"
 
-#include "cwindowcontrol.hxx"
 #include "ctaskbar.hxx"
 
 /********************************************************************************************
@@ -68,11 +67,11 @@ using namespace NxWM;
 
 CTaskbar::CTaskbar(void)
 {
-  m_taskbar       = (NXWidgets::CNxWindow *)0;
-  m_background    = (NXWidgets::CNxWindow *)0;
-  m_backImage     = (NXWidgets::CImage    *)0;
-  m_topApp        = (IApplication         *)0;
-  m_started       = false;
+  m_taskbar     = (NXWidgets::CNxWindow *)0;
+  m_background  = (NXWidgets::CNxWindow *)0;
+  m_backImage   = (NXWidgets::CImage    *)0;
+  m_topApp      = (IApplication         *)0;
+  m_started     = false;
 }
 
 /**
@@ -81,6 +80,9 @@ CTaskbar::CTaskbar(void)
 
 CTaskbar::~CTaskbar(void)
 {
+  // The disconnect,putting the instance back in the state that it
+  // was before it was constructed.
+
   disconnect();
 }
 
@@ -107,7 +109,8 @@ bool CTaskbar::connect(void)
 }
 
 /**
- * Disconnect from the server
+ * Disconnect from the server.  This method restores the taskbar to the
+ * same state that it was in when it was constructed.
  */
 
 void CTaskbar::disconnect(void)
@@ -141,6 +144,7 @@ void CTaskbar::disconnect(void)
       // Then delete the task bar window
 
       delete m_taskbar;
+      m_taskbar = (NXWidgets::CNxWindow *)0;
     }
 
   if (m_background)
@@ -157,8 +161,22 @@ void CTaskbar::disconnect(void)
       // Then delete the background
 
       delete m_background;
+      m_background = (NXWidgets::CNxWindow *)0;
+    }
+
+  // Delete the background image
+
+  if (m_backImage)
+    {
+      delete m_backImage;
+      m_backImage = (NXWidgets::CImage *)0;
     }
 
+  // Reset other variables
+
+  m_topApp  = (IApplication *)0;
+  m_started = false;
+
   // And disconnect from the server
 
   CNxServer::disconnect();
@@ -279,7 +297,9 @@ bool CTaskbar::startWindowManager(void)
               continue;
             }
 
-          // Hide all appliations except for the top application
+          // Hide all applications except for the top application.  NOTE:
+          // topIndex may still be -1, meaning that there is no application
+          // and that all applications should be hidden.
 
           if (i != topIndex)
             {
@@ -303,6 +323,17 @@ bool CTaskbar::startWindowManager(void)
           i++;
         }
 
+      // If there is no top appliation (i.e., no applications or all applications
+      // are minimized), then draw the background image
+
+      if (!m_topApp)
+        {
+          if (!redrawBackgroundWindow())
+            {
+              return false;
+            }
+        }
+
       // Draw the taskbar.  It will be draw at a higher level than the application.
 
       return redrawTaskbarWindow();
@@ -418,7 +449,7 @@ bool CTaskbar::startApplication(IApplication *app, bool minimized)
 {
   // Get the widget control associated with the task bar window
 
-  NXWidgets::CWidgetControl *control =  m_taskbar->getWidgetControl();
+  NXWidgets::CWidgetControl *control = m_taskbar->getWidgetControl();
 
   // Get the bitmap icon that goes with this application
 
@@ -633,10 +664,10 @@ bool CTaskbar::stopApplication(IApplication *app)
         }
     }
 
-  // destroy the application
+  // Destroy the application (actually, this just sets up the application for
+  // later destruction.
 
-  CWindowControl *control = app->getWindowControl();
-  control->destroy(app);
+  app->destroy();
 
   // Re-draw the new top, non-minimized application
 
@@ -674,6 +705,47 @@ void CTaskbar::getDisplaySize(FAR struct nxgl_size_s &size)
 }
 
 /**
+ * Simulate a mouse click or release on the icon at index.  This method
+ * is only available during automated testing of NxWM.
+ *
+ * @param index.  Selects the icon in the start window
+ * @param click.  True to click and false to release
+ */
+
+#if defined(CONFIG_NXWM_UNITTEST) && !defined(CONFIG_NXWM_TOUCHSCREEN)
+void CTaskbar::clickIcon(int index, bool click)
+{
+  if (index < m_slots.size())
+    {
+      // Get the image widget at this index
+
+      NXWidgets::CImage *image = m_slots.at(index).image;
+
+      // Get the size and position of the widget
+
+      struct nxgl_size_s imageSize;
+      image->getSize(imageSize);
+
+      struct nxgl_point_s imagePos;
+      image->getPos(imagePos);
+
+      // And click or release the image at its center
+
+      if (click)
+        {
+          image->click(imagePos.x + (imageSize.w >> 1),
+                       imagePos.y + (imageSize.h >> 1));
+        }
+      else
+        {
+          image->release(imagePos.x + (imageSize.w >> 1),
+                         imagePos.y + (imageSize.h >> 1));
+        }
+    }
+}
+#endif
+
+/**
  * Create a raw window. 
  *
  * 1) Create a dumb CWigetControl instance
@@ -690,7 +762,7 @@ NXWidgets::CNxWindow *CTaskbar::openRawWindow(void)
 {
   // Initialize the widget control using the default style
 
-  CWindowControl *control = new CWindowControl((NXWidgets::CWidgetStyle *)NULL);
+  NXWidgets::CWidgetControl *control = new NXWidgets::CWidgetControl((NXWidgets::CWidgetStyle *)NULL);
 
   // Get an (uninitialized) instance of the background window as a class
   // that derives from INxWindow.
@@ -727,7 +799,7 @@ NXWidgets::CNxTkWindow *CTaskbar::openFramedWindow(void)
 {
   // Initialize the widget control using the default style
 
-  CWindowControl *control = new CWindowControl((NXWidgets::CWidgetStyle *)NULL);
+  NXWidgets::CWidgetControl *control = new NXWidgets::CWidgetControl((NXWidgets::CWidgetStyle *)NULL);
 
   // Get an (uninitialized) instance of the framed window as a class
   // that derives from INxWindow.
diff --git a/NxWidgets/nxwm/src/cwindowcontrol.cxx b/NxWidgets/nxwm/src/cwindowmessenger.cxx
index 6c2144bad7..4e458566d3 100644
--- a/NxWidgets/nxwm/src/cwindowcontrol.cxx
+++ b/NxWidgets/nxwm/src/cwindowmessenger.cxx
@@ -1,5 +1,5 @@
 /********************************************************************************************
- * NxWidgets/nxwm/src/cwindowcontrol.cxx
+ * NxWidgets/nxwm/src/cwindowmessenger.cxx
  *
  *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
@@ -46,28 +46,23 @@
 
 #include "nxwmconfig.hxx"
 #include "cstartwindow.hxx"
-#include "cwindowcontrol.hxx"
+#include "cwindowmessenger.hxx"
 
 /********************************************************************************************
  * Pre-Processor Definitions
  ********************************************************************************************/
 
 /********************************************************************************************
- * CWindowControl Method Implementations
+ * CWindowMessenger Method Implementations
  ********************************************************************************************/
 
 using namespace NxWM;
 
 /**
- * Constructor
- *
- * @param style The default style that all widgets on this display
- *   should use.  If this is not specified, the widget will use the
- *   values stored in the defaultCWidgetStyle object.
+ * CWindowMessenger Constructor
  */
 
-CWindowControl::CWindowControl(FAR const NXWidgets::CWidgetStyle *style)
-: NXWidgets::CWidgetControl(style)
+CWindowMessenger::CWindowMessenger(void)
 {
   // Open a message queue to communicate with the start window task.  We need to create
   // the message queue if it does not exist.
@@ -82,36 +77,28 @@ CWindowControl::CWindowControl(FAR const NXWidgets::CWidgetStyle *style)
     {
       gdbg("ERROR: mq_open(%s) failed: %d\n", g_startWindowMqName, errno);
     }
-
-  // Add ourself as the window callback
-
-  addWindowEventHandler(this);
 }
 
 /**
- * Destructor.
+ * CWindowMessenger Destructor.
  */
 
-CWindowControl::~CWindowControl(void)
+CWindowMessenger::~CWindowMessenger(void)
 {
   // Close the message queue
 
   (void)mq_close(m_mqd);
- 
-  // Remove ourself from the window callback
-
-  removeWindowEventHandler(this);
 }
 
 /**
  * Destroy the application window and everything in it.  This is
- * handled by CWindowControl (vs just calling the destructors) because
+ * handled by CWindowMessenger (vs just calling the destructors) because
  * in the case where an application destroys itself (because of pressing
  * the stop button), then we need to unwind and get out of the application
  * logic before destroying all of its objects.
  */
 
-void CWindowControl::destroy(IApplication *app)
+void CWindowMessenger::destroy(IApplication *app)
 {
   // Send a message to destroy the window isntance at a later time
 
@@ -135,7 +122,7 @@ void CWindowControl::destroy(IApplication *app)
  */
 
 #ifdef CONFIG_NX_MOUSE
-void CWindowControl::handleMouseEvent(void)
+void CWindowMessenger::handleMouseEvent(void)
 {
   // The logic path here is tortuous but flexible:
   //
@@ -157,8 +144,8 @@ void CWindowControl::handleMouseEvent(void)
   //  7. NXWidgets::CWidgetControl records the new state data and raises a
   //     window event.
   //  8. NXWidgets::CWindowEventHandlerList will give the event to this method
-  //     NxWM::CWindowControl.
-  //  9. This NxWM::CWindowControl method will send the a message on a well-
+  //     NxWM::CWindowMessenger.
+  //  9. This NxWM::CWindowMessenger method will send the a message on a well-
   //     known message queue.
   // 10. This CStartWindow::startWindow task will receive and process that
   //     message by calling CWidgetControl::pollEvents()
@@ -181,7 +168,7 @@ void CWindowControl::handleMouseEvent(void)
  */
 
 #ifdef CONFIG_NX_KBD
-void CWindowControl::handleKeyboardEvent(void)
+void CWindowMessenger::handleKeyboardEvent(void)
 {
   // The logic path here is tortuous but flexible:
   //
@@ -203,8 +190,8 @@ void CWindowControl::handleKeyboardEvent(void)
   //  7. NXWidgets::CWidgetControl records the new state data and raises a
   //     window event.
   //  8. NXWidgets::CWindowEventHandlerList will give the event to this method
-  //     NxWM::CWindowControl.
-  //  9. This NxWM::CWindowControl method will send the a message on a well-
+  //     NxWM::CWindowMessenger.
+  //  9. This NxWM::CWindowMessenger method will send the a message on a well-
   //     known message queue.
   // 10. This CStartWindow::startWindow task will receive and process that
   //     message by calling CWidgetControl::pollEvents()