I apologize for the delay in the response.
3D in DXFramework, while possible in theory, is essentially not supported since 0.9.4. We decided that to focus on 2D games instead of 3D because there are many other better 3D engines out there. 3D should work with the latest versions of DXFramework but it hasn't been tested and I am not in a position to help debug it right now. I'm sorry about this. If you figure things out and don't mind posting the changes you needed to make to get 3D working fine, let me know.