public function registerAction()
 {
     if (isset($this->params['doit'])) {
         $user = new TUser($this->params);
         if (!$user->save()) {
             $this->flash['error'] = 'twitter.user.register.error';
             return array('user' => $user);
         }
         $this->flash['message'] = 'twitter.user.register.ok';
         return $this->redirect(array('action' => 'login'));
     }
 }