open GMain let window = GWindow.window ~border_width:2 () let vbox = GPack.vbox ~packing:window#add () let label = GMisc.label ~text:"There have been no clicks yet" ~packing:vbox#pack () let button = GButton.button ~label:"click me" ~packing:vbox#pack () let () = window#event#connect#delete ~callback:(fun _ -> true); window#connect#destroy ~callback:Main.quit; button#connect#clicked ~callback:window#destroy; window#show (); Main.main ()