/**
  * Add required resources for a custom interaction (css, js) in the item directory
  * 
  * @throws common_exception_Error
  */
 public function addRequiredResources()
 {
     $typeIdentifier = $this->getRequestParameter('typeIdentifier');
     $itemUri = urldecode($this->getRequestParameter('uri'));
     $item = new core_kernel_classes_Resource($itemUri);
     $resources = $this->registry->addRequiredResources($typeIdentifier, $item);
     $this->returnJson(array('success' => true, 'resources' => $resources));
 }