[Editor's note: Peter rewrote this article after a reader pointed out he over-engineered his original solution. ("What can I say: The code worked -- I just didn't need nearly as much code as I thought ...

The Managed Extensibility Framework (MEF) has been part of the .NET Framework since .NET 4.0. There are many tutorials across the Web on how to use MEF with Windows Forms, WPF and Windows Store. MEF ...