Having trouble entering time values with MaskedTextbox

Question

I'm using the MaskedTextbox for .NET 3.5 SP1, from the WPF toolkit. I've got a MaskedTextbox on a WPF page, it fills fine from a SQL Server database, but when I tried to edit the value nothing at all happens. I can select anything, but typing over it, or pressing the delete key or anything else I can thing of, does nothing to the value there. I want to use this to allow a user to enter or edit a time value, like this: 9:30 AM would appear as "09:30 AM". Here's the XAML that I've specified:

<cusControls:MaskedTextBox x:Name="mtbTime"
        Mask="90:00 >LL" Margin="5,0,0,0"
        Text="{Binding ElementName=ThisDateTime,Path=TimePart,Converter={StaticResource NullableTimeToUnderscoreConverter}}" />

(This is a part of a user control I'm making called "ThisDateTime".) What am I doing wrong and how do I fix it?

Answer 1

I haven't seen the source for the text box, but ran into something similar myself.

• Could it be a problem with your partially-entered text either not matching the mask, or not matching the converter?
• Is the UpdateSourceTrigger on the Binding somehow set to UpdateProperty, or is something similar happening in the code-behind?