CPPopupButton in toolbar not copying menu attributes

Here's code demonstrating the issue: http://gist.github.com/21968

Essentially: I have a popup menu in my toolbar. The items in the menu have tags assigned to them when the item is created, in the toolbar delegate method itemForItemIdentifier:willBeInsertedIntoToolbar:.

When selecting a menu item, however, it can be shown to have no tag. I am aware that you do some archiving/copying such that the object which is passed in the toolbar delegate method is not the same object which actually ends up in the toolbar. However, this incomplete attribute copying is hazardous.