title: Bind to Parent Object Property with RelativeSource
body: <p>I've built a WPF based Treeview with</p>
  
  <p>Item<br>
  -Subitem</p>
  
  <p>If Subitem is selected, I would like to display also Properties of Item.</p>
  
  <pre><code>&lt;StackPanel Grid.Column="2" DataContext="{Binding ElementName=myTreeView, Path=SelectedItem}"&gt;
    &lt;TextBox Text="{Binding Path=Name, Mode=TwoWay}" /&gt;
    &lt;TextBox Text="{Binding RelativeSource={???} Path=Name, Mode=TwoWay}" /&gt;
  &lt;/StackPanel&gt;
  </code></pre>
  
  <p>I guess I need to use a RelativeSource statement, but not quite sure how to do so.</p>