When does an NSTableView drag and which column did it drag to?

FROM : Macintosh Developer
DATE : Wed Jul 26 06:24:52 2006

All,

I have an NSTableView with one row and multiple columns. I store 
photo thumbnails in this NSTableView as well as some other information.

When I drag the thumbnails around in the NSTableView, I would like to 
be notified of when the drag has completed and which column the drop 
occured in. I can use "tableViewSelectionDidChange" to inform my 
NSTableView's delegate of when the drag begins and even which column 
is being dragged... but haven't found anything that tells me when the 
drag ends and where the thumbnail has been dragged.

I have seen DraggingInfo protocol but that's working at a much lower 
level than I want to be working at.

Any suggestions on how to proceed?

-- John