I'm pretty sure this has been covered before, but I didn't see it in the (recent) archives.

I have a cursor with several indexes on it as the record source of a grid. I would like to allow the user to click on any column header and re-order the grid according to their choice. Where do I start?
If this is something that's in a class somewhere, then I'd appreciate some directions on how to do the class thing (newbie to VFP6).
Help?