object
val virtual obj : [> `expander ] Gobject.obj
method expanded : bool
method label : string
method label_widget : GObj.widget
method set_expanded : bool -> unit
method set_label : string -> unit
method set_label_widget : GObj.widget -> unit
method set_spacing : int -> unit
method set_use_underline : bool -> unit
method spacing : int
method use_underline : bool
end