/**
  * Move the specified id toward the begining of the set.
  * @param object Id $id The Id of the item to move.
  * @access public
  * @return void
  */
 function moveUp($id)
 {
     // Store the old order
     $oldOrder = $this->_items;
     // move the Item
     parent::moveUp($id);
     // update the database with the new order keys.
     $this->_updateOrders($oldOrder);
 }