/**
  * Validate the form
  */
 private function validateForm()
 {
     if ($this->frm->isSubmitted()) {
         // cleanup the submitted fields, ignore fields that were added by hackers
         $this->frm->cleanupFields();
         // validate fields
         $this->frm->getField('name')->isFilled(BL::err('AuthorIsRequired'));
         $this->frm->getField('email')->isEmail(BL::err('EmailIsInvalid'));
         // no errors?
         if ($this->frm->isCorrect()) {
             // build item
             $item['id'] = $this->id;
             $item['status'] = $this->record['status'];
             $item['name'] = $this->frm->getField('name')->getValue();
             $item['email'] = $this->frm->getField('email')->getValue();
             // insert the item
             BackendAgendaModel::updateSubscription($item);
             // trigger event
             BackendModel::triggerEvent($this->getModule(), 'after_edit_subscription', array('item' => $item));
             // everything is saved, so redirect to the overview
             $this->redirect(BackendModel::createURLForAction('subscriptions') . '&report=edited-subscription&id=' . $item['id'] . '&highlight=row-' . $item['id'] . '#tab' . \SpoonFilter::toCamelCase($item['status']));
         }
     }
 }