public function __construct($classAttrValuePairs = null, $sortby = null, $getrelatedobjectcollection = 0)
 {
     require_once dirname(__FILE__) . '/datalayer.php';
     $className = str_replace('collection', '', get_class($this));
     require_once dirname(__FILE__) . '/../' . $className . '.php';
     $datalayer = new DataLayer();
     $datalayer->OpenConnection();
     $datalayer->GetObjectCollection($this, $className, $classAttrValuePairs, $sortby, $getrelatedobjectcollection);
     $datalayer->CloseConnection();
 }