/**
  * After loading the collection, perform the afterLoad resource method on each item
  *
  * @return $this
  */
 protected function _afterLoad()
 {
     $this->walk('afterLoad');
     return parent::_afterLoad();
 }
 /**
  * Init collection select
  *
  * @return Mage_Core_Model_Resource_Collection_Abstract
  */
 protected function _initSelect()
 {
     parent::_initSelect();
     $this->getSelect()->join(array('_attribute_table' => $this->getTable('eav/attribute')), '`_attribute_table`.`attribute_id` = `main_table`.`attribute_id`', array('attribute_code', 'frontend_label'));
     return $this;
 }