public ListBoxItem(String name, String title) {
    super(name, title);

    listBox = new ListBox();
    listBox.setName(name);
    listBox.setTitle(title);
    listBox.setVisibleItemCount(5);
    listBox.setTabIndex(0);
    listBox.setHeight("50px");

    valueChangeHandler =
        new ChangeHandler() {
          @Override
          public void onChange(ChangeEvent event) {}
        };
    listBox.addChangeHandler(valueChangeHandler);

    wrapper = new HorizontalPanel();
    wrapper.add(listBox);
  }
 @Test
 public void checkTabIndex() {
   ListBox listBox = new ListBox(false);
   listBox.setTabIndex(2);
   Assert.assertEquals(2, listBox.getTabIndex());
 }