When is a #include for a VCX actually bound?

I don't need to include the .h files with my app (right?).

I changed a VCX to reference a non-existant #define in my .h file. I got an error (of course). I added the #define to the .h file, yet my VCX still complains. Apparently I have to do something to "refresh" my VCX's view of the .h file.

I'm guessing I could build the project. Is this correct, or are there other ways? (Or am I altogether confused?)


Bob