Jim,

OK. I see what you are saying.

Thanks,

Ken


>
>The benefit is that you can add and modify behaviors without changing the form. Since both ImportABC and ImportDEF are subclasses of the same class, you simply make a new subclass named ImportGHI to provide for another file structure. There are no changes required to add the new behavior in either the form or the button. The user interface component has become universal and is able to adapt to new requirements without changing its code.