Tag extends DataObject {      private static $db = array(         'Name' => 'varchar(000)',     );      private static $summary_fields = array(         'Name' => 'Title',     );      private static $field_labels = array(         'Name'     );      private static $belongs_many_many = array(         'PortfolioItemPages' => 'PortfolioItemPage'     );      // tidy up the CMS by not showing these fields     public function getCMSFields() {         $fields = parent::getCMSFields();         $fields->removeByName("PortfolioItemPages");          return $fields;     }      static $default_sort = "Name ASC"; }  