public function activateAction()
 {
     $form = new Admin_Form_Menu();
     if ($this->_request->isPost()) {
         if ($form->isValid($this->_request->getPost())) {
             $this->_menuItemMapper->setActiveValue($form->getValue('menuItemId'), $form->getValue('active'));
             $cache = Zend_Registry::get('cache');
             $cache->clean(Zend_Cache::CLEANING_MODE_MATCHING_TAG, array(Application_Model_Cache_Menu::TAG));
             return $this->_helper->redirector('index', 'index');
         }
     }
 }