Can I still set my account picture to an image from disk in OS X Mountain Lion? I can't seem to browse my hard disk for a custom image to use as my account picture anymore since installing OS X Mountain Lion.

The new popover shows that I can now only choose from the default set of pictures, pick something I've recently used, or take a new one with my Mac's iSight camera:



(I have no real inclination towards golf.)

There was always a Choose button in the panel dialog in previous versions of OS X, but now it's gone. Is there no way to browse my disk for a custom image anymore on Mountain Lion, or is there hopefully a defaults switch somewhere that I need to flip to enable it again?
You can drag in any picture from the Finder into the Preference Pane to change the custom image. Not as convenient as using the Open Dialog though...