/**
  * Sorting by most recent order first.
  *
  * @param  Varien_Object
  * @param  Varien_Object
  * @return bool
  */
 protected function _sortOrdersMostRecentFirst(Varien_Object $a, Varien_Object $b)
 {
     return $a->getOrderDate() < $b->getOrderDate();
 }