Using unmanaged class in managed class?

I’m working on a C++ project, and I’d like to be able to mix managed and unmanaged code. I’d like to have certain classes unmanaged be accessable in managed functions.

Of note, I’m doing my unmanaged class in an inline header file, which is included using #include.

I tried using #pragma unmanaged, yet that doesn’t seem to work. What I’d like to do is make certain parts of my back-end unmanaged and possibly assembly, but have my front-end be done in CLR, which will allow me to use designer mode and textbox controls, etc.