Read original post at Kevin Dockx's Blog
WCF RIA Services Contrib is an open-source CodePlex project, maintained by Colin Blair, which consists of a collection of community contributions that can be used with WCF RIA Services. At the moment, it consists of ComboBoxExtensions, a Data Validation Framework, Entity Tools, Entity Graph, Fluent Metadata API & T4RIA – you can find more info on those here.