How to add QR code widget from touchgfx-open-repository in code?

Hello, I want to generate QR code dynamically and also want to clear it sometimes during run time. I got github link and added those files in my project. Still I am not sure how to call it. You have mentioned to call qrCode.setXY(0,0) , qrCode.setQRCode(&code), qrCode.setScale(4) , add(qrCode) methods but I am unable to find it.

https://github.com/touchgfx/touchgfx-open-repository/tree/master/widgets/QRCode

Can you please help ?