Make up a .PRG with CLEAR CLASS commands for all the classes involved. These commands must be done in the order from most derived to base because you cannot clear a base class before all classes derived from it have been cleared from memory. If you have to call the .PRG several times before it works then you have got the order wrong. Or simply let the list of CLEAR CLASS commands execute as often as there are commands, then it will work even if you have the order exactly backwards. *g*

Of course, this will fail if there are outstanding references to the classes.