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copied!<p>Ultimately, it turned out that Windows 7 handles the ValueConverter differently than does Windows XP. If I removed:</p> <pre><code>SelectedItem="{Binding SelectedPerson, Converter={StaticResource PersonRoleToPerson}, Mode=OneWayToSource}" </code></pre> <p>then I got all the proper templating. The issue was in the ValueConverter, although Windows XP was firing it multiple times, while Windows 7 only fired it once at the time the underlying collection notified of it's change (as it should!)</p> <p>My ValueConverter initially returned null in both Convert and ConvertBack (because it was OneWayToSource I only needed ConvertBack). If either method didn't satisfy the type check on the object, null was returned. I now believe this to be a bad practice. Instead it should ultimately return DependencyProperty.UnsetValue if you fall all the way through:</p> <pre><code>public class PlaintiffRoleToPerson : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { return DependencyProperty.UnsetValue; } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { var plaintiff = value as Plaintiff; if (plaintiff != null) { return plaintiff.Person; } return DependencyProperty.UnsetValue; } } </code></pre> <p>Why Windows 7 handled that differently than Windows XP is still a mystery, but I now have everything working. I'm counting down the days until Windows XP hits end of support and I can drop it from our supported OSes.</p>

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