I have a dataform defined like so:
<telerikInput:RadDataForm PropertyValidationCompleted="dfOptician_PropertyValidationCompleted" VerticalOptions="Start" HorizontalOptions="Start" x:Name="dfOptician" Source="{Binding SelectedRosterItem, Path=Exam}" ValidationMode="Immediate" CommitMode="Immediate" FormValidationCompleted="dfOptician_FormValidationCompleted">
However, the dfOptician_PropertyValidationCompleted never fires