If you don't want to use a control that knows how to display the information in your cad file, then you will have to learn how to display it and implement a control for this purpose by hand.
It's probably going to be a lot more work creating a control from scratch to read and display the cad drawing than it would be to solve the problem with the viewer control provided to you.
Contact the company who created this control for help regarding any errors that you are encountering while using it.
-Frinny