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