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PODependency Property Binding Not Updating Target
 

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    <p>I have a custom dependency property:</p> <pre><code> public static readonly DependencyProperty HeaderProperty = DependencyProperty.Register("HeaderProperty", typeof(string), typeof(RadAdjustableSlider)); public string Header { get { return (string)GetValue(HeaderProperty); } set { SetValue(HeaderProperty, value); } } </code></pre> <p>I then have a binding in my xaml:</p> <pre><code>&lt;TextBlock Name="txtHeader" Text="{Binding ElementName=main, Path=Header, UpdateSourceTrigger=PropertyChanged, Mode=OneWay}" /&gt; </code></pre> <p>Note that I also have this in the declaration at the top of the xaml file:</p> <pre><code> x:Name="main" </code></pre> <p>Finally, I have this constructor:</p> <pre><code> public RadAdjustableSlider() { InitializeComponent(); this.Header = "Header"; } </code></pre> <p>When I put this control inside of another parent control, the Header textblock is blank. Why?</p> <p>Edit: <a href="http://geekswithblogs.net/thibbard/archive/2008/04/22/wpf-custom-control-dependency-property-gotcha.aspx" rel="nofollow noreferrer">This blog</a> says that the correct way to do this is by providing a <a href="http://msdn.microsoft.com/en-us/library/system.windows.validatevaluecallback.aspx" rel="nofollow noreferrer">ValidateValueCallback</a> in the <code>DependencyProperty.Register</code> call, but that seems like quite a bit of plumbing and doesn't explain the way dependency properties behave when interacting with external controls. Am I really going to have to write callback functions for all of my dependency properties?</p>
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    1. COScratch that previous answer. I just re-read your question again and I think I misunterstood your setup. Is the custom DP defined in the Main.Xaml class?
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    2. CO@Foovanadil The DP is defined in RadAdjustableSlider.xaml.cs - the "main" element is a `RadAdjustableSlider : UserControl`
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