If a RadioGroup is used for editing a required field, the validator is fired if a selection is not made. However, when selecting a field after the validation message appears and blurring the field, the other inputs of the RadioGroup remain marked as invalid.
Open the dojo:
https://dojo.telerik.com/eSEliROr/3
When an option is selected and the input is no longer focused, the validation message should disappear. Also, the other inputs should no longer be marked as invalid.