# Class virtual OgtkButtonProps.tool_item_notify

    class virtual tool_item_notify : [> `toolitem ] Gobject.obj -> object .. end

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

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

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

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

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