Display a UserControl from code module in Operator UI with .NET

I am developing a new Operator UI for my test system, but have have a problem.

I would like my code modules to have an area in my Operator UI, this area should drawn by the code module while it is running (e.g. updating a graph). My idea was that the Operator UI should only get a UserControl from the code modules (via UImessage) and place it on the form.

But I have problem passing the UserControl from the code module to the UI since it is different AppDomains. Both the Operator UI and the code modules are written in C#. 

I have seen examples of this (https://decibel.ni.com/content/docs/DOC-1756) but not for .NET