public function getSignatureBox()
{
$QRContent = "@code:" . \Yii::app()->moduleAPI->get('OphCoCvi')->getUniqueCodeForCviEvent($this->event) . "@key:" . $this->getEncryptionKey();
$QRHelper = new \SignatureQRCodeGenerator();
return $QRHelper->generateQRSignatureBox($QRContent, true, array("x" => 1000, "y" => 600), 200);
}