I would like more details on this Jim. To me, it seem like a waste of space to create a superclass with all the properties and events that all the sub-class will ever use, when only a fraction of these properties and methods will be effectively used by a given sub-class.

>Having a property or method that is not in the parent class can be indicative of a poor class design. The purpose of the highest class level is to define the public interface for all of its subclasses. Introducing a new property or method down the inheritence tree causes the interface to change within the particular class.