Show NSPopover from NSToolbarItem Button

Question

I want to show an NSPopover from an NSToolbarItem button in my toolbar.
(i.e. positioned below the button).

Ideally, I want to pass the

Answer 1

The answer appears to be in the video for the 2011 WWDC Session 113, "Full Screen and Aqua Changes." Basically, put an NSButton inside the NSToolbaritem and use the view of that.

A blog post is here: http://www.yellowfield.co.uk/blog/?p=33, and a sample project is on github at http://github.com/tevendale/ToolbarPopover

All in the sprit of http://xkcd.com/979!