I have discovered an issue where the SelectedItem for a RadComboBox is null.
I use a System.Collections.Generic.IList to populate the RadComboBox.
When the IList has more than one item, then the RadComboBox works fine, and I can get the SelectedItem.
When the IList only has one item, then the RadComboBox has a SelectedItem of null.
Please see the attached to see how I populate the RadComboBox