specifies the types of toplevel widgets to include. Allowed types are GTK_UI_MANAGER_MENUBAR, GTK_UI_MANAGER_TOOLBAR and GTK_UI_MANAGER_POPUP.
a newly-allocated GSList of all toplevel widgets of the requested types. Free the returned list with g_slist_free(). [element-type GtkWidget][transfer container GtkWidget]
Obtains a list of all toplevel widgets of the requested types. Since 2.4