Indeed currently our demos are compatible with RIA services for Silverlight 3 and Visual Studio 2008 however RIA services for Silverlight 4 and Visual Studio 2010 are different and that is why you have these problems. Next week we will publish officially our Silverlight 4 demos
however since RIA services for Silverlight 4 and Visual Studio 2010 will require .NET 4 installed on the server most probably the first version of our demos will be without DomainDataSource example - once our admins migrate Telerik servers to .NET 4 and confirms that everything is running smoothly we will readd the demo.
In the meantime you can check the attached example with RadGridView for Silverlight 4, WCF RIA Services and Entity Framework 4.0. The grid is bound to almost 2 million records using a complex query (join between Orders and Order_Details).
In the future you (and we) will not have such problems since RIA Services are included (finally!) in the Silverlight tools installation.
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