Screen sharing with lid closed

Hi,
I'm experiencing weird behaviour when I try to share the screen of my MBPwRD with its lid clsoed.  The MBPwRD shows up in the Finder sidebar as a device that I can connect to, and I can initiate screen sharing from another Mac on my network.  However, after a couple of seconds the screen share window goes black.  It then seems to try to reconnect but fails.  If I close the screen sharing window and return to the Finder, the MBPwRD no longer shows in the sidebar.
Anyone else experiencing this?
LM

You can, but you need additional hardware to do so:
http://www.matrox.com/graphics/en/gxm/products/mac/home.php
Hope this helps...

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