Text getter is being called twice when validation is on.

Unlike other WPF controls, when i put this for validation : 

IsTextDataBindingEnabled="True"
Text="{Binding ValidationText,ValidatesOnDataErrors=True, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"

My property ValidationText is being called twice. Before the view is ready, and after. I noticed that ValidatesOnDataErrors is causing this behavior. Is this something that can be fixed on your side? Am I doing something wrong?

Thank you!