/**
  * Add hidden fieldset with custom hidden fields to edit page form
  */
 protected function showFormBeforeText()
 {
     parent::showFormBeforeText();
     // Make AjaxLogin work on EditPage without losing user changes - @author: Inez
     $this->out->addHtml(Html::hidden('wpLogin', '') . "\n");
     $this->out->addHtml("\n" . $this->renderHiddenFields() . "\n");
     $this->out->addHtml("\n" . $this->renderCallbackNotices() . "\n");
 }