/**
  * Add  elements to the panel.
  *
  * @param PanelRowInterface $row The row to which the element shall get added to.
  *
  * @return void
  */
 protected function parsePanelSubmit(PanelRowInterface $row)
 {
     if (!$row->hasElement('submit')) {
         $row->addElement(new DefaultSubmitElementInformation());
     }
 }