code: public static CmsFocusedScrollingHandler installFocusedScrollingHandler(ScrollPanel scrollPanel) {
  
          if (scrollPanel == null) {
              throw new UnsupportedOperationException("No scroll panel given");
          }
          CmsFocusedScrollingHandler handler = new CmsFocusedScrollingHandler(scrollPanel);
          handler.register();
          return handler;
      }
docs: Installs a focused scrolling handler on the given widget.<p>
  
  @param scrollPanel the scroll panel
  
  @return the focused scrolling handler