Change sort order on drilldown

Hello

I have a chart, that looks like the below.

It's sorted on the Value field, such that categories (a Hierarchy containing "ProcID" and "ExecutionDate") with the largest value are at the top. This looks ridiculous when a user drills down into a ProcID to expand the ExecutionDate level:

Obviously at that level, it needs to be sorted by ExecutionDate rather than the Value. Is there a way to have different sort orders at different levels of drilldown?

Thanks
Dan