Monitor not going to sleep when close my lid to MacBook Pro

Hi. I was wondering if there was anyway that I could get my Dell E173FP monitor to sleep when I close the lid to my macbook pro. I do not have it on mirroring mode. When I close the lid to my laptop it will just switch my desktop to the monitor instead of the monitor going to sleep with my macbook. When I press the power button and click sleep or go to the apple menu and click sleep it will work though. This really irritates me and I would like It to sleep when I close the lid instead of having to do more. Please help.

Sounds like the system is going into Clamshell mode.  Here's some info on that mode. 
One workaround would be to disconnect line voltage as that's required for clamshell mode, there may be others.
http://support.apple.com/kb/HT3131
Regards,
Captfred

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