I can't find airplay when upgrade to mountain lion

when I upgrade my Mac OS to Mountain Lion, I can't find the airplay option in the display menu under system preference, can anyone tell me how to set up the mirror imagine on my TV by using airplay?
p.s. i have also upgrade my Apple TV into latest version.
thanks

AirPlay
AirPlay Mirroring requires a second-generation Apple TV or later, and is supported on the following Mac models: iMac (Mid 2011 or newer), Mac mini (Mid 2011 or newer), MacBook Air (Mid 2011 or newer), and MacBook Pro (Early 2011 or newer).
Several Apple Articles Regarding AirPlay
Apple TV (2nd and 3rd gen)- How to use AirPlay Mirroring
How to set up and configure AirPort Express for AirPlay and iTunes
Troubleshooting AirPlay and AirPlay Mirroring
Using AirPlay

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