# Class virtual OgtkBinProps.expander_notify

    class virtual expander_notify : [> `expander ] Gobject.obj -> object .. end

    val obj : ([> `expander ] as 'a) Gobject.obj

    method private notify : 'b. ('a, 'b) Gobject.property -> callback:('b -> unit) -> GtkSignal.id

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

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

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

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

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