title: WPF - simple relative path - FindAncestor
body: <p>In the XAML below the ToolTip correctly binds to RelativeSource Self. However, I can't for the life of me work out how to get the TextBlock in the commented block to refer to SelectedItem.Description</p>
  
  <pre><code>&lt;Controls:RadComboBoxWithCommand x:Name="cmbPacking"
                                   Grid.Row="2"
                                   Grid.Column="5"
                                   ItemsSource="{Binding PackingComboSource}"
                                   DisplayMemberPath="DisplayMember"
                                   SelectedValuePath="SelectedValue"
                                   SelectedValue="{Binding ElementName=dataGrid1, Path=SelectedItem.PackingID}"
                                   ToolTip="{Binding RelativeSource={RelativeSource Self}, Path=SelectedItem.Description}"
                                   IsSynchronizedWithCurrentItem="True"
                                   Style="{StaticResource comboBox}"&gt;
   &lt;!--                    &lt;Controls:RadComboBoxWithCommand.ToolTip&gt;--&gt;
                  &lt;!--                        &lt;TextBlock Text="{Binding RelativeSource={RelativeSource Self}, Path=SelectedItem.Description}" TextWrapping="Wrap" Width="50"/&gt;--&gt;
   &lt;!--                    &lt;/Controls:RadComboBoxWithCommand.ToolTip&gt;--&gt;                   
  &lt;/Controls:RadComboBoxWithCommand&gt;
  </code></pre>
  
  <p>I would appreciate any suggestions</p>
  
  <p>Thanks - Jeremy</p>