Add doxygen docs of wxTaskBarButton.

Author: Chaobin Zhang

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77587 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/frame.h

@@ -445,6 +445,23 @@ public:
     */
     virtual void SetToolBar(wxToolBar* toolBar);
 
+    /**
+        MSW-specific function for accessing the taskbar button under Windows 7 or later.
+
+        Returns a wxTaskBarButton pointer representing the taskbar button of the
+        window under Windows 7 or later. The returned wxTaskBarButton may be
+        used, if non-@c NULL, to access the functionality including thumbnail
+        representations, thumbnail toolbars, notification and status overlays,
+        and progress indicators.
+
+        The returned pointer must @em not be deleted, it is owned by the frame
+        and will be only deleted when the frame itself is destroyed.
+
+        This function is not available in the other ports by design, any
+        occurrences of it in the portable code must be guarded by
+        @code #ifdef __WXMSW__ @endcode preprocessor guards.
+    */
+    wxTaskBarButton* MSWGetTaskBarButton();
 
     void PushStatusText(const wxString &text, int number = 0);
     void PopStatusText(int number = 0);