window1.setContent(new Label("Hello Bar"));
window1.open(display);
Sheet sheet = new Sheet();
sheet.setContent(new Label("Hello Foo"));
sheet.open(window1);
Frame window1a = new Frame();
window1a.setTitle("Window 1 A");
window1a.setPreferredSize(160, 120);
window1a.open(display); // window1);