How can I get the same undefined ProgressBar as ICS with 2 rotating circles?

Question

I am currently writing an open source project that aims to port the famous Holo theme to previous versions of Android (since 1,6!!!)

Everything works fine and I am reall

Answer 1

As addendum to Profete162's answer: I know that Jake has managed to bypass this limitation in his implementation for SherlockActionBar and make both the spinning images visible. Looking at the source code for abs__progress_medium_holo.xml it looks like he simply flipped around the fromDegrees and toDegrees values, although there might be more to it that I'm not aware of.