The TreeItem widget is a branch for a Tree widget

class Demo extends Composite
{
public Demo()
{
Tree tree = new Tree();
initWidget(tree);
TreeItem outerRoot = new TreeItem(”Item 1″);
outerRoot.addItem(”Item 1-1″);
outerRoot.addItem(”Item 1-2″);
outerRoot.addItem(”Item 1-3″);
outerRoot.addItem(new CheckBox(”Item 1-4″));
tree.addItem(outerRoot);

TreeItem innerRoot = new TreeItem(”Item 1-5″);
innerRoot.addItem(”Item 1-5-1″);
innerRoot.addItem(”Item 1-5-2″);
innerRoot.addItem(”Item 1-5-3″);
innerRoot.addItem(”Item 1-5-4″);
innerRoot.addItem(new CheckBox(”Item 1-5-5″));

outerRoot.addItem(innerRoot);
}
}