`([> Gtk.action_group ] as 'b) Gobject.obj ->
object ('a)
val after : bool
val obj : 'b Gobject.obj
method after : 'a
method connect_proxy :
callback:(GAction.action -> GObj.widget -> unit) -> GtkSignal.id
method disconnect_proxy :
callback:(GAction.action -> GObj.widget -> unit) -> GtkSignal.id
method post_activate : callback:(GAction.action -> unit) -> GtkSignal.id
method pre_activate : callback:(GAction.action -> unit) -> GtkSignal.id
end`