title: How to expose internal control's property to its parent UserControl in WPF
body: <p>I have a DialogPrompt UserControl that will have an Image and a TextBlock. Here is the template:</p>
  
  <pre><code>    &lt;UserControl&gt;   
        &lt;Button x:Name="_OkButton" Content="OK"/&gt;
        &lt;DockPanel &gt;
          &lt;Image/&gt;
          &lt;TextBlock x:Name="_DialogTextBox" /&gt;
        &lt;/DockPanel&gt;
      &lt;/UserControl&gt;
  </code></pre>
  
  <p>How do I expose Source property of the Image and Text property of the TextBlock inside my UserControl?</p>