iFrame C# Windows Forms

Hi friends,

I have an issue with signing data from the web interface. DatePicker fails on open and I can`t select date.
Javascript error "TypeError: Cannot read properties of null (reading 'length')";

I using VS2019, C#, WebView2 component

Is there an example of how to have an iframe appear in the C# application?  I want to create a transaction and then display it for the sender in an iframe to finish the process