public function deleteHyperlinkByIndex($index)
    {
        //check whether workshett name is set or not
        if ($this->worksheetName == '')
            throw new Exception('Worksheet name not specified');
        $strURI = Product::$baseProductUri . '/cells/' . $this->getFileName() .
            '/worksheets/' . $this->worksheetName . '/hyperlinks/' . $index;
        $signedURI = Utils::sign($strURI);
        $responseStream = Utils::processCommand($signedURI, 'DELETE', '', '');
        $json = json_decode($responseStream);
        if ($json->Status == 'OK') {
            return true;
        } else {
            return false;
        }

    }