Karl Shifflett has published an application that is an example for writing
a globalized WPF & Silverlight platform neutral control designer.
Both WPF & Silverlight applications use the same Design library. You can check out the source code to see how this is done. This source code is in VB.NET. Later this week, I’ll be posting another full featured article and code example in C# and VB.NET for writing a platform neutral control designer for WPF & Silverlight custom controls. The project also includes two controls you can use in your projects.