code: protected Element createPlaceholder(Element element) {
  
          Element result = CmsDomUtil.clone(element);
          result.addClassName(I_CmsLayoutBundle.INSTANCE.containerpageCss().groupcontainerPlaceholder());
          result.getStyle().setBackgroundColor("transparent");
          return result;
      }
docs: Creates a place-holder for the group-container.<p>
  
  @param element the element
  
  @return the place-holder widget