title: WPF Groupbox header position alignment
body: <p>Is it possible to set the position alignment for a <code>GroupBox</code> <code>Header</code> in WPF?  The default is to place in the top left corner of the <code>GroupBox</code> outline but I would like it to be centered at the top. I know that you can set the properties of the text using:</p>
  
  <pre><code>&lt;GroupBox Grid.Row="1" HorizontalAlignment="Center"&gt;
     &lt;GroupBox.Header&gt; 
        &lt;TextBlock Text="Cash Match" Foreground="Black" FontWeight="Bold"/&gt;
     &lt;/GroupBox.Header&gt;
  &lt;/GroupBox&gt;
  </code></pre>
  
  <p>But I'm looking to set the position of it with respect to the <code>GroupBox</code> outline. </p>