HT201335 Apple TV - mirror secondary monitor

I'm using a secondary LED display attached to my MacBook Pro running Mountain Lion.  I have the desktop stretched across the secondary display so I can throw pallets, menus or a browser running my fav video training (not available in iTunes), onto that monitor and out of my way while I work.    
Can I mirror the secondary monitor instead of the primary to Apple TV?  So far, I've only been able to mirror the primary.
Thanks in advance.

That is different.
I have an iPad 3rd generation and an Apple TV 3rd generation and not having that problem.
iOS 7.0.4 and the latest Apple TV firmware of 6.0.2
What generation of Apple TV ?
What firmware on the Apple TV ?
More thinking and info is needed here.

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