Converts feed view to drilldown pattern

Before:
http://monosnap.com/file/truCJA1LwkhaqXTllBdkN2zBiPDdQA

After:
http://monosnap.com/file/cxtv9T5AKN7re2LPrN8FllDfqDMm27
Why is drilldown still using Masterdetail classes?