public void init() {
final LegacyWindow main = new LegacyWindow("#2053");
setMainWindow(main);
Button nothing = new Button("Do nothing");
main.addComponent(nothing);
nothing.setDescription("Even though no action is taked, this window is refreshed to "
+ "draw changes not originating from this window. Such changes include changes "
+ "made by other browser-windows.");
Button add = new Button("Add a window", new Button.ClickListener() {
@Override