Label extra = new Label("Extra");
layout1.addComponents(extra);
assertSame(extra, layout1.getComponent(4));
layout1.removeAllComponents();
layout1.addComponents(children[3], children[2], children[1],
children[0]);
assertOrder(layout1, new int[] { 3, 2, 1, 0 });
VerticalLayout layout2 = new VerticalLayout(children);