# Class virtual OgtkBinProps.expander_sigs

    class virtual expander_sigs : object .. end

    method private virtual connect : 'b. ([> `expander ], 'b) GtkSignal.t -> callback:'b -> GtkSignal.id

    method private virtual notify : 'b.
             ([> `expander ] as 'a, 'b) Gobject.property ->
             callback:('b -> unit) -> GtkSignal.id

    method activate : callback:(unit -> unit) -> GtkSignal.id

    method notify_expanded : callback:(bool -> unit) -> GtkSignal.id

    method notify_label : callback:(string -> unit) -> GtkSignal.id

    method notify_label_widget : callback:(GObj.widget -> unit) -> GtkSignal.id

    method notify_spacing : callback:(int -> unit) -> GtkSignal.id

    method notify_use_underline : callback:(bool -> unit) -> GtkSignal.id