User defined type

I need to create my own type and I know how to write it, but VB keeps saying that I can't define
a Public User-defined type within private object module.Where should I write my type?? Please help!
Thanx in advance for any aswer.

Celery

I expect your doing it in a form. Use a module instead.

How do I do it in a module? I have never used it before.