I want to multi group my data on the following :
costElement2, costElement3, costElement4, accountId.

However I want to display this data in the ext grid in a display sort order as follows (and not in the sort order in which the store is sorted to group the data):
costelement2SortOrder, costelement3SortOrder, costelement4SortOrder, accountidSortOrder.

In other words I want to group my data using a particular multi grouping key, but display the data in the grid using a different display sort order.

Is this possible using the multiGroup store.

Thanks in advance and all help will be highly appreciated. I have spent nearly 3 days trying to figure out how to do this but have had no luck.