virtual void DoMoveWindow(int x, int y, int width, int height);
virtual void DoSetItemClientData( int n, void* clientData );
virtual void* DoGetItemClientData( int n ) const;
virtual void DoMoveWindow(int x, int y, int width, int height);
virtual void DoSetItemClientData( int n, void* clientData );
virtual void* DoGetItemClientData( int n ) const;