title: Binding to a Datacontext of an ancestor
body: <p>It would be best if showed you my code first and then ask the question:</p>
  
  <pre><code>&lt;Window  DataContext="{Binding RelativeSource={RelativeSource Self}}"&gt;
  &lt;Grid&gt;
  &lt;DataGrid ItemsSource="{Binding Printers}" &gt;
  &lt;DataGrid.Columns&gt;
  &lt;DataGridComboBoxColumn Header="Drucker Typ" ItemsSource="{Binding Relative" SelectedItemBinding="{Binding PrinterType, Mode=TwoWay}"  Width="Auto" ItemsSource="{Binding}" /&gt;
  &lt;/DataGrid.Columns&gt;
  &lt;/DataGrid&gt;
  &lt;/Window&gt;
  </code></pre>
  
  <p>I have the <code>DataGridComboBoxColumn</code> and want to bind the <code>ItemsSource</code> to the <code>DataContext</code> of the Window and the <code>SelectedItem</code> to the current <code>ItemsSource</code> Object of the DataGrid.</p>
  
  <p>How can this be done ?</p>
  
  <p>Thanks! </p>