It seems that is a question related rather to Visual Studio than to Test Studio.
An option here is to turn off the managed Debugging Assistant for the "NonComVisibleBaseClass" exception in Visual Studio:
1. Navigate to Debug->Exceptions.
2. Expand "Managed Debugging Assistants"
3. Uncheck the NonComVisibleBaseClass Thrown option.
4. Click "OK"
I recorded a short video as a demonstration.
Let me know if this helps.
the Telerik team