I'd like to sort a column of names completely within my own code when the user clicks the column header. It's a list of names that should mostly be sorted alphabetically except for a small number of names that should be grouped (these groups are specified in a command line argument, if you're curious). Is there some way I can override the sorting event for a particular column with my own method? Ideally I would get the unsorted list as an event argument and then return the sorted list at the end.

Thanks.