I have derived my own class from a UpDownBase. Like so:
__gc public class MyNumericUpDown : public UpDownBase, ISupportInitialize
{...}
I created my own custom controls using my derived class. I go to build, and

How to integrate an MFC 7.0 DLL into a standard C++ application.
I'm going to use an OPC Toolkit for C++ and have to interface my MFC DLLs.
How do I do this?
Any recommendations?  Links?

Project built using /CLR, but code is old and has not been converted
specifically to "managed" (__gc or __value).
Everything seemed to work great, until I got the following error.
I have a class, let's call it CMyLegacyClass, that has some CString (NOT