gistfile1.txt

    Window.alert("about to add handlers");
    Window.addCloseHandler(new CloseHandler<Window>() {
      @Override
      public void onClose(CloseEvent<Window> event) {
        Window.alert("close");
      }
    })                     ;
    Window.addWindowClosingHandler(new ClosingHandler() {
      @Override
      public void onWindowClosing(ClosingEvent event) {
        Window.alert("closing");
      }
    });
    Window.alert("handlers added correctly");