I am looking for a viable solution to the error message that many of us are facing: Error in casting 'Microsoft.Expression.DesignModel.DocumentModel.DocumentPrimitiveNode' to type 'Microsoft.Expression.DesignModel.DocumentModel.DocumentCompositeNode'. The problem is not that the app stops working all together, but it is the "legend or Layer List" that become uncontrollable or un-expandable.
According to ESRI, this is the "Microsoft problem" and the only solution is that we wait. However, I believe ESRI might already have a work-around for this, but ESRI needs to find it out and post it.
The essential functionality for layer listing and legends for "composite" map services fails in the Silverlight API due to this error, but the same functionality works perfectly fine for identical composite map services in apps developed through the GUI Silverlight Viewer. This indicates that there might be a readily available solution to this problem, at least in the Viewer GUI. ESRI needs to find out how the Viewer works in this regard and share that with the rest of us. Thanks
