/**
  * DOC ggu Comment method "getDisplayImage".
  *
  * <p>mainly for label provider of update manager dialog.
  *
  * @param type
  * @return
  */
 public Object getDisplayImage(Object element, int columnIndex) {
   IProcessUpdateManagerProvider[] processProviders = reader.getProcessProviders();
   for (IProcessUpdateManagerProvider provider : processProviders) {
     Object displayImage = provider.getDisplayImage(element, columnIndex);
     if (displayImage != null) {
       return displayImage;
     }
   }
   return null;
 }