/**
  * Called to download this content item and stream it directly to the browser
  * 
  * @param HTTP_Request $request
  */
 public function download($request)
 {
     if ($request->param('ID')) {
         $object = ExternalContent::getDataObjectFor($request->param('ID'));
         if ($object && $object instanceof ExternalContentItem) {
             $object->streamContent();
         }
     }
 }