Airplay doesn't works on ipod, ipad but works on itunes

Hi All

Here's my setup

- 2 wired PC with iTunes (Version 11.0.1.12)

- 1 wireless iPad 2 (version 6.0.1)

- 1 wireless iPod Touch (4th gen version 6.0.1)

- 1 Wireless Apple TV (3rd gen version 5.1.1)

All the devices have access to internet and are all in the same wireless network. I update them all and restart every device on my network

The iTunes see the apple tv and I'm able to share videos and picture on my tv by iTunes (airplay icon).

The problem is with my ipod and ipad. I didn't see any airplay icon on the multitask tray of any devices. I also try to install remote but I didn't see any Apple TV icon on the remote app's home page.

It seems that the ipod and ipad didn't receive the broadcast from the apple tv.

What am I doing wrong ?

Thank you very much