[atv2]ML airplay sound to XBMC

Hi,

I have looking around but have found nothing answering my question. So excuse me if it was already answered somewhere else

I am using MoutainLion on my mac. Mountain Lion can airplay sound directly to airplay enabled devices:
http://howto.cnet.com/8301-11310_39-5748...tain-lion/

Is XBMC (latest official version) supposed to appear there? Cause it doesnt for me.
I should mention that other software like airfoil correctly see and stream to xbmc on atv2

Thanks a lot