---WARNING---- NEWBIE QUESTION -----WARNING------

A project I'm working on has a startup program as the main file which has '#INCLUDE Foxpro.h' near the beginning. I have not yet built the project into an app. During testing, when I try to use the constants in a messagebox() function from a method in some other part of the project, it can't find them and crashes. What's the trick to making this work across the rest of the project?

Thanks,
Neil Preston