I would guess that the unresolved reference is to the Silverlight version of the System.Windows.dll. You will have to change the references in the theme project to point to the WPF version of the dlls.
You can also look at the WPF themes project (coordinated by Rudi Grobler), which already has the BureauBlue.
Franci Penov
2009-10-23 02:36:53