Is there any way to dynamically fill in the control name and control library in the
IMPLEMENTS statement:

Since the IMPLEMENTS keyword is part of the DEFINE CLASS command, about the only way that I can think of doing this is to keep yout class definitition in a memo field, and then at runtime, before you instantiate the class, substitute the name and library, create a temporty prg for the class efinition using STRTOFILE(), compile the prg, and then instantiate the class.

After you are finished with the class, do not forget to issue a CLEAR CLASS so you can delete the temporary prg.