public function deleteAction()
 {
     SxCms_Acl::requireAcl('subscriptions', 'subscription.delete');
     $subscription_id = $this->_getParam('id');
     $proxy = new SxCms_Event_Subscription_DataMapper();
     $subscription = $proxy->getSubscriptionById($subscription_id);
     $Subscription = new SxCms_Event_Subscription();
     $Subscription->setSubscriptionId($subscription_id);
     $Subscription->delete();
     $flashMessenger = $this->_helper->getHelper('FlashMessenger');
     $flashMessenger->addMessage($this->admin_tmx->_('subscriptiondeleted'));
     $this->_helper->redirector->gotoSimple('list', 'event_subscription', null, array('id' => $subscription->getEventId()));
 }