public function formSucceeded(Form $form, $values)
 {
     if ($values->remember) {
         $this->user->setExpiration('14 days', FALSE);
     } else {
         $this->user->setExpiration('20 minutes', TRUE);
     }
     try {
         $userManager = new Model\UserManager($this->user, $this->database);
         $userManager->login($values->username, $values->password);
     } catch (Nette\Security\AuthenticationException $e) {
         $form->addError($e->getMessage());
     }
     if ($form->getPresenter()->isAjax()) {
         $form->getPresenter()->redrawControl('sign');
     }
 }