public function onBeforeRender()
 {
     parent::onBeforeRender();
     if ($this->customizeMode) {
         parent::initializeJs($this->responderController, 'OW_Components_DragAndDrop', $this->sharedData);
         $jsDragAndDropUrl = OW::getPluginManager()->getPlugin('BASE')->getStaticJsUrl() . 'drag_and_drop.js';
         OW::getDocument()->addScript($jsDragAndDropUrl);
     }
 }