AdvancedDataGrid with multiple custom sort functions

Question

I have an AdvancedDataGrid with several levels of nested data in which each level needs to have a custom sort.
Ex:
A
     Z
          C
          D
          A
     Y
          C
          D
          A
     X
          C
          D
          A
B
     Z
          C
          D
          A
etc...
Is this possible without a massive sort function that takes every possible combination into account? Better yet, I'm already sorting it in SQL - can I disable the automatic sort and just have it spit out the data in the order XML passes it to ActionScript?
Thanks

Answer 1

Thanks for the tip, but unfortunately that's not what I'm looking for. I'm not trying to remove the end users' ability to sort, I'm trying to disable the automatic alphabetic sort that the ArrayCollection/AdvancedDataGrid does when it first renders the table. I know it can be overridden by using the "compareFunction" callback, but the compareFunction only iterates through the rows once, and I effectively need something that will iterate through 3 times - one for each nesting level.
The cookbook suggests concatenating the fields and then applying the sorting logic, but that works best if you're applying the same sort to every level of nesting. In my case, it means a massive function along the lines of:
switch(concat_fields1) {
     case 'AZC':
          switch(concat_fields2) {
               case 'AZD':
                    return 1;
                    break;
               default:
                    return -1;
                    break;
          break;
     case 'AZD':
          etc.
So far, that's the only solution I've found.