function admin_delete($id = null, $type = null)
 {
     $this->CoreCustomField->id = $id;
     $pageId = $this->CoreCustomField->field('core_page_id');
     $this->redirectDestination = array('controller' => 'core_pages', 'action' => 'view', $pageId);
     parent::admin_delete($id, $type);
 }