>PMFJI, but I have just had to do this very thing.
>
>If you haven't already done the hacking and haven't already made new subclasses from the new class library, move the class back where it was so all the subclasses (and/or forms) will work.

Actually, if you already have, you can still use the CB to Redefine the subclasses or forms.
View both the parent class library and the subclass library (or form) in the CB.
Right click on the subclass - choose Redefine.
A combobox with all other form classes in the current list will come up for you to select the new parent class.