Hi

In additon to what Andrew has said.

If in case you are using EditModeStarted/Ended for updating the view model, then you have two options:

* You can use some other mechanism other than EditModeStarted/Ended events, like focus change (for this you can bind to IsFocusWithin property of the ValueEditor to know when the user leaves the focus), to handle updating of the view model.

* Leave the IsAlwaysInEditMode set to false and instead specify a ValueToDisplayTextConverter that will show the prompt characters when not in edit mode. Here’s the code for ValueToDisplayTextConverter:

    public class MyMaskDisplayTextConverter : IValueConverter

    {

        private static IValueConverter g_baseDisplayTextConverter;

        static MyMaskDisplayTextConverter( )

        {

            XamMaskedEditor tmpEditor = new XamMaskedEditor( );

            g_baseDisplayTextConverter = tmpEditor.ValueToDisplayTextConverterResolved;

        }

        public object Convert( object value, Type targetType, object parameter, System.Globalization.CultureInfo culture )

        {

            object val = g_baseDisplayTextConverter.Convert( value, targetType, parameter, culture );

            XamMaskedEditor maskEditor = parameter as XamMaskedEditor;

            if ( null != maskEditor )

            {

                if ( null == val || val is string && 0 == ( (string)val ).Length )

                    val = maskEditor.GetText( MaskMode.IncludeBoth );

            }

            return val;

        }

        public object ConvertBack( object value, Type targetType, object parameter, System.Globalization.CultureInfo culture )

        {

            return g_baseDisplayTextConverter.ConvertBack( value, targetType, parameter, culture );

        }

    }

Hi

Is this issue resolved ? Do you have any further questions regarding this ? 

I am very sorry for the delay. It worked fine when the converter was set, it display the blank and the format before the control gets focus.

Issue now is once date is selected it gets binded to a property in my ViewModel. When I clear the value on clicking a button by setting date property to nothing. The value appears to be on the date, but when i click the control it disappear and again the date appears after lossing the focus.

Now did not had time to debug this issue, I will update after this week end. Thanks

Hello

Have you managed to resolve this issue ? Is there any update ? Thanks.

I have used NullText property, which worked for my scenario

Sorry, It is working correctly. It was my mistake in the coding which was causing issue. This is now resolved for me. Thanks for your help

Now I got a problem with our Dirty Tracking, When the I set the (val = "__/__/____") for date that has empty value, it actally fires the change event once again, which we do not want to happen. We want our change event fire when user manually clear the date, not when window loaded with default date. Any suggestion how to overcome this issue?

Thanks for your help, finally I was able to make it work by changing it to  val = "__/__/____".  I don't why maskEditor.Text is empty string, but maskEditor.GetText(MaskMode.IncludeBoth) is giving the old value which was set to nothing from the ViewModel.

I am glad your suggestion help, thanks you for your help.

Public Function Convert(ByVal value As Object, ByVal targetType As System.Type, ByVal parameter As Object, ByVal culture As System.Globalization.CultureInfo) As Object Implements

System.Windows.Data.IValueConverter.Convert

Dim val As Object  = g_baseDisplayTextConverter.Convert(value, targetType, parameter, culture)

Dim maskEditor As XamMaskedEditor = TryCast(parameter, XamMaskedEditor)

If maskEditor IsNot Nothing Then

   If val Is Nothing OrElse TypeOf val Is String AndAlso 0 = DirectCast(val, String).Length Then

   ' val = maskEditor.GetText(MaskMode.IncludeBoth)

"__/__/____"

   End If

End If

Return val

End Function