>>Is there a way to change an existing objects base class. ....
>>What I need to do now is go back to an old app and change the base classes to
>>classes from my class libraries.
>The Class Browser will allow you to change a class' parent class. Click the 'Redefine' button.

A somewhat less pretty way to do this is to USE the .SCX, and do

REPLACE class with 'newtxt' FOR class='oldtxt'
REPLACE classLoc WITH '../classes/newlib' FOR class='newtxt'

and other similar commands. Then, you can MODI FORM and fire off lots
of .ResetToDefault methods for the classes where you used to set properties
individually, but have since updated the class....