We have updated the WCF Samples. Please see the changes below:

1. We have added support for the tab Code in the report designer.
2. We have made some changes in the Stimulsoft.Report.StiOptions.Silverlight.WCFService.WCFExportDocument event. The EventHandlers type was changed and a new Filter property was added in it. This property passes the type of an exported file for a task into the SaveFileDialog.

Please download the updated samples here.
These new samples will work in the prerelease build of Stimulsoft Reports.Silverlight. The prerelease build will be available on November, 10. It can be downloaded here.