code: private void addScrollHandler() {
  
          m_scrollPanel.addScrollHandler(new CmsScrollToBottomHandler(new Runnable() {
  
              /**
               * @see java.lang.Runnable#run()
               */
              public void run() {
  
                  if (!m_loading) {
                      startLoading();
                      addMoreListItems();
                  }
              }
          }, SCROLL_THRESHOLD));
  
      }
docs: Adds the scroll handler to the scroll panel which makes more groups visible when the user
  scrolls to the bottom.<p>