function changeMyPassword($newPassword, $currentPassword = null)
    {
        $response = $this->call( new Command\Me\ChangePassword($newPassword, $currentPassword) );
        if ( $ex = $response->hasException() )
            throw $ex;


        if ($currentPassword !== null)
            return true;

        $r = $response->expected();
        $r = ($r instanceof iDataEntity) ? $r->get('result') : $r;
        return $r;
    }