public function addWorksheet($worksheetName)
    {
        $strURI = Product::$baseProductUri . '/cells/' . $this->getFileName() . '/worksheets/' . $worksheetName;
        $signedURI = Utils::sign($strURI);
        $responseStream = Utils::processCommand($signedURI, 'PUT', '', '');
        $json_response = json_decode($responseStream);
        if ($json_response->Code == 201)
            return true;
        else
            return false;

    }