Unless you violate you license agreement and decompile the VFP source code, make those changes in C/C++ and then recompile it, you have to live with VFP's base classes. As Mike suggests, why not just subclass them and do what ever you want and can do within the confines of the VFP design?
There are a number of third-party Grid classes that may be able to provide what you need already - just do some googling.
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