I would like to know where the image files for the Ambiance theme's buttons can be found. (The buttons that are used for dialong boxes and the like; not the window control buttons.)

I've tried /usr/share/themes/Ambiance/gtk-2.0/, but that doesn't contain a "buttons" folder like the normal themes do.

I've tried to puzzle out the gtkrc file, but to no avail.

Yes, I know you can just use a screenshot, but not for the purpose I need. (I need the correctly antialiased transparent edges.)

If somebody could explain to me where I might find those files, I would much appreciate it.