Mountain Lion, AirPlay Mirroring, and multiple monitors - how to choose display?

I have an iMac running OS X 10.8.1 with two external monitors connected via Thunderbolt.  I have a 3rd-gen Apple TV on the same network.  I can turn on AirPlay Mirroring and my primary monitor will display on my TV.  However, I would like another monitor mirrored instead.  I have looked but can't seem to find a setting to choose which monitor is mirrored.
Any help would be greatly appreciated, thank you!

You can remove the Logmein sound driver.
You will no longer be able to hear your Mac from your remote machine.
Start Terminal and paste:
sudo kextunload /system/library/extensions/logmeinsounddriver64.kext
I did this long time ago because I was having sound problems on Lion.

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