>I want to change a form's class from an existing class to a more complex class on the same lineage. There's probably a simple way to tweak the .scx but I can't figure it out. Shouldn't be any problems since the new class has all the PEMs of the old + more.
>How do I do it?

Open the SCX directly, and change the CLASS and CLASSLOC values. Then, open the form with the Form Designer and check it. Did I remember to tell you to pray and to make a backup before? <g>