public static void main (String [] args) {
	Display display = new Display ();
	final Shell shell = new Shell (display);
	shell.addListener (SWT.Close, new Listener () {
		@Override
		public void handleEvent (Event event) {
			int style = SWT.APPLICATION_MODAL | SWT.YES | SWT.NO;
			MessageBox messageBox = new MessageBox (shell, style);
			messageBox.setText ("Information");
			messageBox.setMessage ("Close the shell?");
			event.doit = messageBox.open () == SWT.YES;
		}
	});
	shell.pack ();
	shell.open();
	while (!shell.isDisposed ()) {
		if (!display.readAndDispatch ()) display.sleep ();
	}
	display.dispose ();
}