|GTK+ Reference Manual|
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GObject +----GInitiallyUnowned +----GtkObject +----GtkWidget +----GtkContainer +----GtkBin +----GtkItem +----GtkMenuItem +----GtkTearoffMenuItem
When its menu is shown normally, the GtkTearoffMenuItem is drawn as a dotted line indicating that the menu can be torn off. Activating it causes its menu to be torn off and displayed in its own window as a tearoff menu.
When its menu is shown as a tearoff menu, the GtkTearoffMenuItem is drawn as a dotted line which has a left pointing arrow graphic indicating that the tearoff menu can be reattached. Activating it will erase the tearoff menu window.
typedef struct _GtkTearoffMenuItem GtkTearoffMenuItem;
The GtkTearoffMenuItem struct contains private data only, and should be accessed using the functions below.
for further discussion of menus in GTK.