in nested modules it is impossible to change the superclass of a class in the inspector. If you make a change, the Super TextField updates to the old value. Is there a trick how to do this anyway?
This appears, if the class you wanna use the new Super class has private scope.
Is the class you are changing also inside that same module as the class you are setting it’s super to? If not, there’s your problem. Private class can only be referenced from within the same module. If so, try using the fully qualified class name, as in, Module1.ClassName.