http://developers.de/blogs/damir_dobric/archive/2009/11/04/managed-extensibility-framework-in-msdn-flash.aspxFor all German speaking visitors, I would like to point out my MSDN article, which introduce Managed Extensibility Framework. If you would like to see how to build Composed Applications with .NET 4.0 I would highly recommend to take a look on MEF. . KlassischenCommunityServer 2008 SP1 (Build: 30619.63)