Can i use my 21.5" imac as an external monitor for my macbook pro?

I have a 21.5" iMac (with Intel processor) that I'm trying to use an external monitor for a new Macbook Pro.  Both machines have a thunderbolt input.  I bought a Belkin mini displayport to mini displayport connector, but my macbook is not displaying on the iMac.  I saw videos online showing this done with the 27" iMac, saying you just needed to press Command+F2, but that is not working for me.  I can't seem to find any posts confiming if I can use my 21.5" iMac this way though.

https://discussions.apple.com/thread/4082303?start=0&tstart=0

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