>Is it possible to remove or hide our event/method source code in class library and still include those class libraries in project to compile ? We have temp programmer and may be using a few more in near future. We would like them to subclass our classes but not see source.

Absolutely, but it will hinder debugging if anything goes wrong in the classes. You can compile the classlibs, and then blank out the source code in the Methods fields after compilation. The compiled code in the Objcode field conains the compiled, executable code.

I'd make certain to keep unmodified version of the classlibs around for debugging abd enhancing, at a minim.