Macbook Pro Retina not recognising apple tv

My Macbook Pro Retina not recognizing apple TV... (no airplay icon)

info:

1. Macbook Pro Retina with 10.8.2 .

2. No firewall.

3. Can ping from my MacbookPro to the apple TV (they are on the same network).

4. The Apple TV working smoothly with my iPhones, iPod and iPad.

5. Everything is up2date (MacbookPro and Apple TV)

6. From the "Display" (system preferences) The "AirPlay Mirroring: No Devices Detected"