object
method collapse : callback:(unit -> unit) -> GtkSignal.id
method private virtual connect :
'b. ([> `treeitem ] as 'a, 'b) GtkSignal.t -> callback:'b -> GtkSignal.id
method expand : callback:(unit -> unit) -> GtkSignal.id
method private virtual notify :
'b. ('a, 'b) Gobject.property -> callback:('b -> unit) -> GtkSignal.id
end