Werner,
If you move/create the class in the class designer you use SET CLASSLIB ... ADDITIVE to tell VFP where to find the class definitions.
>I've created a class, with the DEFINE CLASS, in a program file.
>
>When I try to create an instance of this class, outside the program file where I defined the class, I get the "Class definition
not found" error.
>
>How can I make this class visible from other parts of my project,
>e.g. from a form?
>
>Do I have to create the class in the Class Designer, to achieve this?