GtkToolItem::set_proxy_menu_item
void set_proxy_menu_item(string menu_item_id, GtkWidget menu_item);
Sets the GtkMenuItem used in the toolbar overflow menu. The menu_item_id is used to identify the caller of this function and should also be used with get_proxy_menu_item() .
See also: get_proxy_menu_item() , retrieve_proxy_menu_item()