public:
  virtual FXint getContentWidth();
  FXint _getContentWidth();

  virtual FXint getContentHeight();
  FXint _getContentHeight();

  virtual FXint getViewportWidth();
  FXint _getViewportWidth();

  virtual FXint getViewportHeight();
  FXint _getViewportHeight();

  virtual void moveContents(FXint x,FXint y);
  void _moveContents(FXint x,FXint y);

