How can you add a UIGestureRecognizer to a UIBarButtonItem as in the common undo/redo UIPopoverController scheme on iPad apps?

Question

Problem

In my iPad app, I cannot attach a popover to a button bar item only after press-and-hold events. But this seems to be standard for

Answer 1

While this question is now over a year old, this is still a pretty annoying problem. I've submitted a bug report to Apple (rdar://9982911) and I suggest that anybody else who feels the same duplicate it.