code: private void showIsEmptyLabel() {
  
          Label isEmptyLabel = new Label(Messages.get().key(Messages.GUI_TAB_CATEGORIES_IS_EMPTY_0));
          CmsTreeItem treeItem = new CmsTreeItem(false, isEmptyLabel);
          treeItem.setSmallView(true);
          m_scrollList.add(treeItem);
      }
docs: Shows the tab list is empty label.<p>