docs: private Element getTabElement(int tabIndex) {
  
          Element tabRootEl = m_tabPanel.getElement();
          // set an additional css class for the parent element of the .gwt-TabLayoutPanelTabs element
          List<Element> tabDivs = CmsDomUtil.getElementsByClass(
              I_CmsLayoutBundle.INSTANCE.tabbedPanelCss().cmsTabLayoutPanelTab(),
              CmsDomUtil.Tag.div,
              tabRootEl);
          if ((tabDivs != null) && (tabDivs.size() > tabIndex)) {
              return tabDivs.get(tabIndex);
          }
          return null;
      }