Cinema Display power button doesn't sleep

I retired my older 15" Studio Display after recently purchasing a 23" Cinema Display. I loved the feature on my Studio Display that the power button would automatically put my computer to sleep. With my new Cinema display when I push the power button it brings up the Shut Down, Sleep, Restart, dialogue box instead. I changed the system prefs, and it still doesn't work.
Any suggestions?

I have the opposite problem as Michael's. Mine gives me the option to sleep, powerup JUST the diplay or do nothing. I want to be able to powerup/shutdown the whole Mac using the diplay button on the side. Checked the sys pref and nothing there. Maybe somewhere else?
Pls help. Thanks

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