public function __construct($keyselector, $comparer = null)
{
$this->keyselector = $keyselector;
parent::__construct($comparer);
}
public function __construct($orderby = null, $thenby = null)
{
parent::__construct($orderby);
//clean up thenby
$this->thenby = self::AsIComparer($thenby);
}
