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    <p><a href="http://msdn.microsoft.com/en-us/library/system.windows.data.bindingbase.fallbackvalue.aspx" rel="nofollow noreferrer">{Binding } has a FallbackValue, btw.</a></p> <p>Your question, it confuses me. I'd assume your PVM has a collection of PV's as a public property, which is bound within the UI. Also, I think you're mixing terms. Its Model-View-ViewModel where the ViewModel is the DataContext of the View, and the Model is exposed by the ViewModel via a public property. Sounds like if you're binding the window to a collection of ViewModels they are actually Models. It may seem pedantic, but getting your terms correct will help you research and ask questions.</p> <p>Another solution would be to add a Converter to your Binding in combination with FallbackValue (I've had to do this, IIRC). That converter would be an IValueConverter that returns "DependencyProperty.UnsetValue" if the string is null or empty. I think this works sometimes because the TextBox will set the bound property to the empty string rather than null if the TB is empty. Here's a little sample to whet your whistle (not guaranteed to work; you need to debug this and tweak it):</p> <pre><code>public class ThisMightWorkConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { var temp = value as string; if(string.IsNullOrWhiteSpace(temp)) return System.Windows.DependencyProperty.UnsetValue; return temp; } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { return value; // you might need to change this } } </code></pre>
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    1. COWell I may have not express myself clearly. I have a window named ParameterEditorView and a ParameterEditorViewModel. In the ParameterEditorView I have a list of ParameterViewModel. In the ParameterEditorView I have a `ItemsControl` whose `ItemsSource` is binded to the list of ParameterViewModel in the ParameterEditorViewModel. I also define the `DataTemplate` shown above in the ParameterEditorView. The binding is working fine, but I want to know if I can pass the reference of the ParameterView, that is automatically created to display a ParameterViewModel, to the ParameterViewModel.
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    2. CO@jps assuming ParameterView is a UserControl. If you're trying to pass a chunk of UI to the ViewModel or a Model you're doing something wrong. I think it would be to your benefit to state your problem and ask for solutions rather than go down the road you're on. FallbackValue is one option. I edited to add a second option.
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    3. COI guess this second option is good option to overcome the problem. Thanks for the help.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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