making it obvious method is virtual, factoring out GrowBox painting

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@49296 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mac/carbon/window.h

@@ -141,7 +141,7 @@ public:
 
     void MacOnScroll( wxScrollEvent&event );
 
-    bool AcceptsFocus() const;
+    virtual bool AcceptsFocus() const;
 
     virtual bool IsDoubleBuffered() const { return true; }
 
@@ -166,6 +166,7 @@ public:
     // because it is called from its destructor via DeleteChildren
     virtual void        RemoveChild( wxWindowBase *child );
     virtual void        MacPaintBorders( int left , int top ) ;
+    void                MacPaintGrowBox();
 
     // invalidates the borders and focus area around the control;
     // must not be virtual as it will be called during destruction