How to create a Label that has an access key and supports text wrapping

<TextBox Name="textBox1" Width="50" Height="20"/>
<Label Width="200" HorizontalAlignment="Left"
       Target="{Binding ElementName=textBox1}">
  <AccessText TextWrapping="WrapWithOverflow">
    Here is some text that will be wrapped in the label control. 
    Type as much as you can here.
 </AccessText>
</Label>