aXb.addItem("a grand child");
FastTreeItem widgetBranch = a.addItem(new CheckBox("A checkbox child"));
FastTreeItem textBoxParent = widgetBranch.addItem("A TextBox parent");
textBoxParent.addItem(new TextBox());
textBoxParent.addItem("and another one...");
textBoxParent.addItem(new TextArea());
ListBox lb = new ListBox();
for (int i = 0; i < 100; i++) {
lb.addItem(i + "");
}