title: WPF Databinding issue
body: <p>I'm using a RadGridView (Telerik). I'm trying to make a column editable only for certain rows, but what I'm trying doesn't seem to be working and I'm not sure how to do it.</p>
  
  <p>My grid is this:</p>
  
  <pre><code>&lt;telerik:RadGridView HorizontalAlignment="Left" Margin="12,12,12,12" Name="radGridView1" VerticalAlignment="Top" ItemsSource="{Binding FeedList}" ShowGroupPanel="False" AutoGenerateColumns="False" ShowInsertRow="True" EditTriggers="Default"&gt;
      &lt;telerik:RadGridView.Columns&gt;
          &lt;telerik:GridViewDataColumn Header="Feed" DataMemberBinding="{Binding Path=Name}" Width="150" IsReadOnly="{Binding Path=ReadOnly}" /&gt;
          &lt;telerik:GridViewDataColumn Header="Url" DataMemberBinding="{Binding Path=Url}" Width="*"/&gt;
      &lt;/telerik:RadGridView.Columns&gt;
  &lt;/telerik:RadGridView&gt;
  </code></pre>
  
  <p>The bound object has a property, but the Path for the IsReadOnly binding is relative to the DataContext for the form and not the bound object. How would I make it relative to the bound object in this case?</p>