>I think this won't work, but I want to have a method in my form that calls a method and in that method classes are defined... or something like that. Can I mix forms with text-based classes? Do I have to put them into the Main program that calls the form? Thanks!

You may have a separate procedure (or it can be your main procedure) with classes definitions. You can set procedure to this program or use NewObject() function to instantiate your classes.