I have a RadGrid with a NeedDataSource binding. The grid also has an EditTemplate. The update is working well, but on hitting Add New Item, I'm getting errors binding to the edit controls because there is no default value. The dropdownlist errors because the selectedvalue of "" is not in the list. When I fix that by adding a blank item to the list (which I really don't want) the RadNumericEdit errors because "" can't be converted to a double. How do I set default values?