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PODependency Property Binding and updating to a custom control -- It updates, but apparently not both ways?
 

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    <p>ViewModel:</p> <pre><code>public class MyViewModel : INotifyPropertyChanged { public string MyText { ... } } </code></pre> <p>XAML:</p> <pre><code>&lt;my:MySpecialTextBox Text="{Binding MyText}" /&gt; </code></pre> <p>Custom Control:</p> <pre><code>public class MySpecialTextBox : TextBox { static MySpecialTextBox() { TextProperty.OverrideMetadata(typeof(MySpecialTextBox), new FrameworkPropertyMetadata { BindsTwoWayByDefault = true, DefaultValue = string.empty, PropertyChangedCallback = OnTextPropertyChanged }); } private static void OnTextPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { var control = d as MySpecialTextBox; if (control != null) { control.Text = SomeAdjustedValue((string)e.NewValue); } } } </code></pre> <hr> <p>The problem is that while the DependencyProperty in the custom control does adjust properly, it does not update the ViewModel. I realize that this <em>seems</em> as if it should be a CoerceValueCallback due to the naming of SomeAdjustedValue, but Coercion does not change the ViewModel value either. I can't seem to update the value in my ViewModel if it was the trigger for the OnTextPropertyChanged callback to begin with... I did a debug trace and it does not go through the ViewModel a second time with the new value. Not sure what to do here to fix this.</p>
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    1. COJust to make sure I understand- you are expecting a change in the ViewModel, raised to the UI via PropertyChanged notification, to update the UI and then, because of the binding callback, to subsequently be routed back to the ViewModel?
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      1. USChris Shain
 

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