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