I am styling a TreeViewItem. The item has a content presenter that I wish to have a tooltip appear:

```
<ContentPresenter x:Name="PART_Header"
             Cursor="Hand"
             Grid.Column="1"
             ContentSource="Header"
             HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}">
   <ContentPresenter.ToolTip>
       <ToolTip 
                 Placement="RelativePoint" 
                 VerticalOffset="-2" 
                 HasDropShadow="False"
                 BorderBrush="#767676" 
                 Background="#FFF" 
                 Padding="0,1,0,1"
                 VerticalAlignment="Center"
                 Content="{Binding RelativeSource={RelativeSource FindAncestor, 
                 AncestorType={x:Type ContentPresenter}}, Path=Content}"/>
   </ContentPresenter.ToolTip>
</ContentPresenter>

```

This is effectively part of a larger setter that sets the item's control template. However, I cannot seem to get the Tooltip's content binded to the content presenter's content. It keeps appearing blank (a tiny black box). I am new to binding and WPF, so please excuse.