title: self referencing in data bindings
body: <p>Let's say there is a Combobox:     </p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;ComboBox ItemsSource="{Path=ListOfItems}"&gt;
    &lt;ComboBox.ItemTemplate&gt;
      &lt;DataTemplate&gt;
        &lt;CheckBox Tag="{Binding Path=this}"
          Content="{Binding Path=AProperty}" /&gt;
      &lt;/DataTemplate&gt;
    &lt;/ComboBox.ItemTemplate&gt;                                       
  &lt;/ComboBox&gt;
  </code></pre>
  
  <p>Now what I want is that the <em>Content</em> property of ComboBox is bounded to the according <em>list elements's</em> property <em>AProperty</em> (which works fine) and the <em>Tag</em> property is bounded to the <em>list element</em> itself, which does not work. What do I do wrong?</p>