/**
  * Default action to 'add'.
  * @param GridField $gridField
  * @param GridField_URLHandler $component
  * @param DataObject $record
  * @param Controller $controller
  */
 public function __construct(GridField $gridField, $component, $record, $controller)
 {
     parent::__construct($gridField, $component, $record, $controller, 'add');
 }
 public function __construct($gridField, $component, $record, $popupController, $popupFormName)
 {
     parent::__construct($gridField, $component, $record, $popupController, $popupFormName);
 }