Take this scenario where I am working with a grid like control:

<RadGrid DataContext={Binding someDataContextObject, Mode=OneWay}>
   <RadGrid.columns>
      <RadGrid.Column Header="Column Header"
                            DataMember="{Binding dataContextObjectProperty, Mode=OneWay}">
           [...]
           <DataTemplate>
                <MyCustomControl Data="{Binding ???}" />
           </DataTemplate>
      <\RadGrid.Column>
   </RadGrid.columns>   
</RadGrid>

I would like to bind the Data dependency property of MyCustomControl to the DataMember dependency property of the column to avoid multiple bindings to the same data. How do I do it?