use wcf service(no RIA service) as report datasource

[Ww]

Hello
I want to use a wcf service as my report data source
this is what i do
1. Refrence wcf service in library
2. Refrence library to silverlight application
3. Refrence wcf service to silverlight application
4. use wcf telerik report(Hosing WCF Service in IIS)and a report viewer in xaml
but in run time i get a blank report
is there any way that i use a wcf service (no RIA service ) as report data source?
thanks for mention