/**
  * @see SiteTree::doUnpublish
  * @param Page $page
  *
  * @return void
  */
 public function onAfterUnpublish($page)
 {
     if (!$page->hasMethod('getItemsToPublish')) {
         return;
     }
     foreach ($page->getItemsToPublish() as $field) {
         if ($field->hasMethod('doDeleteFromStage')) {
             $field->doDeleteFromStage('Live');
         } else {
             $field->deleteFromStage('Live');
         }
     }
 }