Jeff Handley is pretty happy about the deletion of a class called ControlParameter into the RIA Services RC release. That's why in his post, Jeff takes a look at the changes related to Filters and Parameters.
Yes, ControlParameter is gone, gone, gone--finally! If you’re wondering how you’ll get your UI-based filters and parameters to work without ControlParameter, do not fret… it’s easy; just use an ElementName binding!