Jeff,

You can't use subclassed Pages in the PageFrame, they can only be done at runtime using a Page subclass from a .prg. You can't put anything but Pages in a PageFrame.

The problem might also be in the classlib itself. make sure you can open the class you are trying to use on the form in the class designer.

>The class is based on control and the object causing the error is a label on page 1 of the pageframe in the control.