/**
   * Constructs a new mailboxes widget with a bundle of images.
   *
   * @param images a bundle that provides the images for this widget
   */
  public Mailboxes(Images images) {
    tree = new Tree(images);
    TreeItem root = new TreeItem(
        imageItemHTML(images.home(), "foo@example.com"));
    tree.addItem(root);

    addImageItem(root, "Inbox", images.inbox());
    addImageItem(root, "Drafts", images.drafts());
    addImageItem(root, "Templates", images.templates());
    addImageItem(root, "Sent", images.sent());
    addImageItem(root, "Trash", images.trash());

    root.setState(true);
    initWidget(tree);
  }