Hello guys:
Visual C++ 2003 support IntelliSense both for native C++ and for Managed
Extensions for C++.  The reason you it is not working for your current
project might be a configuration issue or even a product bug.
Let me give you some tips so that you can try to get IntelliSense back for
your MC++ project:
- Is the /clr switch set in the project properties?  Is it a make file
project?
- If the /clr switch is correctly set for your project and still you have no
IntelliSense for your code, go ahead and close your solution and delete the
file with a .ncb extension in your project.  Reopen the solution will make
the IDE rebuild this file and probably restore IntelliSense for you.

In Visual C++ 2005, the IntelliSense experience for managed code is a lot
more compelling.  For a detailed explanation of how our IntelliSense support
works and what to expect from Visual C++ 2005 you can read the following MSDN
article
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnvs05/html/vci
ntellisense.asp

Thanks,
Alvin Chardon
Visual C++ Compiler