>Save() was merely used by me as an example of Method Overloading. Some developers add certain methods and properties to all their classes as part of their homemade (attempt for a) framework.

understood.

Not considering how and where you would implement save() still such a button would get concrete as soon as the form it's on is a concrete form. And if there is no code or anything added or implemented in that button on that way of subclassing, it's nevertheless a concrete button. If there would need to be somthing implemented which, when missing will cause errors, it will cause errors, then it's an error of usage. But it's not an error of the class to instanciate then.

Bye, Olaf.