How to refresh list of Airplay devices on the network?

I'm using a MBA running Mountain Lion. I work on two different networks throughout the day—at my office (where there are 8 Airplay devices, Apple TVs attached to flat panel displays) and at home (two Airplay devices).
The problem I'm running into is that when I arrive at home and want to connect Airplay to a device on my home network, the list of available devices doesn't update from those on my office network, which I'm no longer connected to. There doesn't seem to be any way I've found to refresh the list without having to do a full restart—which just seems wrong.
Is there a way to refresh the list of Airplay devices that show as options in the "AirPlay Mirroring" menu within Displays settings?

I have the same problem... ..
If my apple TV is turned off, and I wake up my MacBook Pro, obviously it's not going to detect my Apple TV.
So, lets say I decide I want to use Airplay.   I go turn on my Apple TV, wait a few minutes.. I would hope that the Airplay Icon would just appear across the top of my screen, but it doesn't. 
I tried running the airport utility, no luck.
I also have to restart my laptop for it to discover my Apple TV, if my apple TV isn't turned on when I start up my computer.

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