HT201335 air play mirroring from mac book pro with apple tv

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hi,
I have a late 2011 mac book pro 13inch, and a new apple tv 2012.  How do I turn on the air play mirroring fuction on my mac book pro when using the apple tv?
Thanks for your help!!
Regards,
penny
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Just upgraded Mountain Lion ($20 from app store) then it works perfect!!!
Thanks for your help!