public void execute(Event<UICategorySelector> event) throws Exception {
   UICategorySelector selector = event.getSource();
   int page = Integer.parseInt(event.getRequestContext().getRequestParameter(OBJECTID));
   UIFormTableIteratorInputSet inputSet = selector.getChild(UIFormTableIteratorInputSet.class);
   inputSet.getUIFormPageIterator().setCurrentPage(page);
   selector.init();
   event.getRequestContext().addUIComponentToUpdateByAjax(selector);
 }
 public UICategorySelector() throws Exception {
   init();
 }