Small correction for wxButton mouse events under GTK 2.0.

Minor doc updates.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17703 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/button.h

@@ -65,6 +65,7 @@ public:
     // --------------
 
     void ApplyWidgetStyle();
+    bool IsOwnGtkWindow( GdkWindow *window );
 
 protected:
     virtual wxSize DoGetBestSize() const;