TemplatePicker error

Question

I have this error when I set the LayerIDs on a TemplatePicker (I am using the code from ESRI Template Picker sample, Visual Studio 2010, Silverlight 4 and ArcGIS API for Silverlight 2.0)  :

"Unable to cast object of type 'Microsoft.Expression.DesignModel.DocumentModel.DocumentPrimitiveNode' to type 'Microsoft.Expression.DesignModel.DocumentModel.DocumentCompositeNode'"

Any suggestions?

Thanks,

DominiqueBroux · Answer

It looks the same issue than http://forums.arcgis.com/threads/8290-DynamicLayer-VisibleLayers-property?highlight=designmodel+documentmodel
 
Morten's asnwer:
  
Unfortunately this is a bug in VS2010 (it used to be there in Blend 4 as well, but got fixed after we reported it - unfortunately didn't make it for VS2010). You code will still compile and run though.