gtk-menu-attach-to-widget (menu widget detacher)

menu -- a gtk-menu widget
widget -- a gtk-widget object that the menu will be attached to
detacher -- a user supplied GtkMenuDetachFunc callback function that will be called when the menu calls the gtk-menu-detach function

Attaches the menu to the widget and provides a callback function that will be invoked when the menu calls the gtk-menu-detach function during its destruction. gtk-menu-detach