public function setOrder($attribute, $dir = 'desc')
 {
     switch ($attribute) {
         case 'wishlists':
             $this->getSelect()->order($attribute . ' ' . $dir);
             break;
         default:
             parent::setOrder($attribute, $dir);
     }
     return $this;
 }
 /**
  * Add sidebar conditions to collection
  *
  * @param Mage_Wishlist_Model_Mysql4_Product_Collection $collection
  * @return Mage_Wishlist_Block_Customer_Wishlist
  */
 protected function _prepareCollection($collection)
 {
     $collection->setPage(1, 3);
     $collection->addAttributeToSort('added_at', 'desc');
     return $this;
 }