".. You can not create a reference that hold instances of all classes of a classlibrary."

Yes you can, and I have seen it done, which is why I asked the question.

Furthermore, the original question to which you replied was regarding the show method of a form, referenced as an instantiated object, so clearly you either didn't read my question or you didn't understand it as you went off an a wholly unrelated tangent.

With regards to that, your assistance in this thread is no longer required.

Regards