`([> `colorbutton ] as 'a) Gobject.obj ->
object
val obj : 'a Gobject.obj
method alpha : callback:(int -> unit) -> GtkSignal.id
method color : callback:(Gdk.color -> unit) -> GtkSignal.id
method private notify :
'b. ('a, 'b) Gobject.property -> callback:('b -> unit) -> GtkSignal.id
method title : callback:(string -> unit) -> GtkSignal.id
method use_alpha : callback:(bool -> unit) -> GtkSignal.id
end`