It appears as though the new spark List component does not honour the `IDropInItemRenderer` interface.

Ie - if I implement `IDropInItemRenderer` on my renderer, the setter of `listData` is never called.

Am I missing something, or is this interface now deprecated?

If so, What is the suggested approach for providing similar dataProvider context information to the renderer? 

For example, I want the renderer for the last item in a collection to behave slightly differently. 

I see that `IItemRenderer` now defines a `listIndex` property, however this approach doesn't work without knowing the count of the source dataProvider.