public static void main(String[] args) {
	final Display display = new Display();
	Shell shell = new Shell(display);
	shell.setLayout(new FillLayout());
	Group group = new Group(shell, SWT.BORDER);
	group.setText("This is a group");
	group.setLayout(new FillLayout());
	Canvas canvas = new Canvas(group, SWT.NONE);
	canvas.addListener(SWT.Paint, new Listener() {
		public void handleEvent(Event event) {
			event.gc.setBackground(new Color(display, 0xff, 0, 0));
			event.gc.fillRectangle(event.x, event.y, event.width, event.height);
		}
	});
	shell.open();
	while(!shell.isDisposed()) {
		if(!display.readAndDispatch()) display.sleep();
	}
	display.dispose();
}