+ virtual QRectF Extents(void);
+ virtual void Enumerate(FILE *);
+ void Delete(Object *);
+ void DeleteSelectedItems(void);
+ void Clear(void);
+ void SelectAll(void);
+ void DeselectAll(void);
+ int ItemsSelected(void);
+ Object * SelectedItem(unsigned int);
+ void MoveContentsTo(Container *);
+ void MoveSelectedContentsTo(Container *);