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POWPF Binding to UserControl Custom DependencyProperty
 

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    <p>I have a custom UserControl called SongDescription:</p> <pre><code>&lt;UserControl x:Class="DPTestAp.SongDescription" ...&gt; &lt;Grid x:Name="LayoutRoot"&gt; &lt;DockPanel Height="50"&gt; &lt;TextBlock x:Name="title" Text="{Binding name}" Width="100" Height="30"/&gt; &lt;TextBox x:Name="lyrics"/&gt; &lt;/DockPanel&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre> <p>I added DependencyProperty to it:</p> <pre><code>public partial class SongDescription : UserControl { public static readonly DependencyProperty SongProperty = DependencyProperty.Register("Song", typeof(Song), typeof(SongDescription)); public Song Song { get { return (Song)GetValue(SongProperty); } set { SetValue(SongProperty, value); updateLyrics() } } private void updateLyrics() { lyrics.Text = Song.lyrics; } public SongDescription() { InitializeComponent(); } } </code></pre> <p>The question is: how to bind something to this SongProperty? I use SongDescription in my main window like this:</p> <pre><code>&lt;local:SongDescription x:Name="songDescription" Song="{Binding DataContext}"/&gt; </code></pre> <p>I cannot make my TextBox <em>lyrics</em> show lyrics. In main window I tried to set DataContext to songDescription, like this:</p> <pre><code>songDescription.DataContext = new Song() { name="Home", lyrics="Hold on, to me as we go" }; </code></pre> <p>or to window itself like this:</p> <pre><code>DataContext = new Song() { name="Home", lyrics="Hold on, to me as we go" }; </code></pre> <p>I even tried to make Song a resource and bind it to SongProperty like this:</p> <pre><code>&lt;Window.Resources&gt; &lt;local:Song x:Key="res" name="Home" lyrics="Hold on, to me as we go"/&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;local:SongDescription x:Name="songDescription" Song="{StaticResource res}"/&gt; &lt;/Grid&gt; </code></pre> <p>Nothing helped. TextBlock <em>title</em> binds song name fine. But I can't make updateLyrics() method be called. (In real life this method is more complicated, so I can't use Binding like with name).</p> <p>Thank you!</p>
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