/**
  * @see GridRow::addAction()
  */
 function addAction($action)
 {
     return parent::addAction($action, GRID_ACTION_POSITION_ROW_LEFT);
 }
 /**
  * @see GridRow::addAction()
  */
 function addAction($action, $position = GRID_ACTION_POSITION_ROW_LEFT)
 {
     return parent::addAction($action, $position);
 }