How to sleep both displays?

Hi all,
I have a MBP and a 27 inch apple display plugged in (not the thunderbolt one, the one before that).
Under SL when I shut the lid on the MBP both the MBP and the monitor went to sleep.
Now under Lion when I shut the lid on the MBP the computer shifts from a dual display to just the 27 inch display and continues to function as normal.
I have had a play with a couple of setting but can't seem to change it back to the way it was with SL.
If I want to send the whole computer and both displays to sleep I have to select sleep from the menu.
Anyone any suggestions please?
Kind Regards

This is called Clamshell mode,  to operate with the lid closed you need:
Requirements for closed display mode:
Power adapter
External keyboard, mouse, or trackpad
External display
Here are the details:
http://support.apple.com/kb/ht3131
Regards,
Captfred

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