Custom Type members Layout with Regions for overrides

Hi All,

I'm trying to create custom Type members Layout xml that will wrap overrides of base class into regions.
For interface I can use
<Group>
     <Name Region="Implementation of ${ImplementsInterface}" />
</Group>

But this is not working for override members because there is no interface  but only BaseClass.

Do you have some ${ImplementsBaseClass} macro I can use?

Thanks,
  Roman Petrenko