Based on issue https://wpftoolkit.codeplex.com/workitem/20198.
It looks like the PropertyItem.OnCoerceValueChanged() method that sets the
Validation.MarkInvalid()
is called before the error is actually sets with IDataErrorInfo (see sample in https://wpftoolkit.codeplex.com/workitem/20198)
It looks like the PropertyItem.OnCoerceValueChanged() method that sets the
Validation.MarkInvalid()
is called before the error is actually sets with IDataErrorInfo (see sample in https://wpftoolkit.codeplex.com/workitem/20198)