Dragging file promises

I am trying to figure out how to drag file promises from views such as =
NSTableView. Before 10.6, I knew how to do this using =
NSFilesPromisePboardType and the =
namesOfPromisedFilesDroppedAtDestination: delegate methods. The docs now =
say I should use (NSString *)kPasteboardTypeFileURLPromise instead of =
NSFilesPromisePboardType. However, I cannot find anything in the docs, =
no sample code or whatever, that uses this. The only thing in the docs =
still refers to NSFilesPromisePboardType, or uses =
dragPromisedFilesOfType:..., which is not appropriate for standard =
controls such as NSTableView (because that should use this implicitly =
behind the scenes). Just replacing NSFilesPromisePboardType by =
kPasteboardTypeFileURLPromise also does not work, the delegate method is =
never called. So can anyone tell me how I do file promises in 10.6+ =
using kPasteboardTypeFileURLPromise?

thanks
Christiaan