public function getCMSFields()
 {
     $fields = parent::getCMSFields();
     $fields->replaceField('Sort', new \ReadonlyField('Sort', 'Sort order'));
     return $fields;
 }
 public function getCMSFields()
 {
     $fields = parent::getCMSFields();
     $fields->replaceField(self::SortFieldName, new \HiddenField(self::SortFieldName));
     return $fields;
 }