public function mergeWorkbook($mergeFileName)
    {
        $strURI = Product::$baseProductUri . '/cells/' . $this->getFileName() . '/merge?mergeWith=' . $mergeFileName;
        $signedURI = Utils::sign($strURI);
        $responseStream = Utils::processCommand($signedURI, 'POST', '', '');
        $json_response = json_decode($responseStream);
        if ($json_response->Code == 200)
            return true;
        else
            return false;

    }