`([> `toolbutton ] as 'a) Gobject.obj ->
object
val obj : 'a Gobject.obj
method icon_widget : callback:(GObj.widget -> unit) -> GtkSignal.id
method label : callback:(string -> unit) -> GtkSignal.id
method label_widget : callback:(GObj.widget -> unit) -> GtkSignal.id
method private notify :
'b. ('a, 'b) Gobject.property -> callback:('b -> unit) -> GtkSignal.id
method stock_id : callback:(GtkStock.id -> unit) -> GtkSignal.id
method use_underline : callback:(bool -> unit) -> GtkSignal.id
end`