/**
  * Select an item.
  *
  * @param item the item.
  */
 private void selectItem(final Label item) {
   if (activeItemIndex != null) {
     hashTags.getWidget(activeItemIndex).removeStyleName(style.activeHashTag());
   }
   item.addStyleName(style.activeHashTag());
   activeItemIndex = hashTags.getWidgetIndex(item);
 }