MacBook Pro and Thunderbolt Monitor

Hello,
I have a MacBook Pro and a Thunderbolt Monitor. The Lion and the Windows7 operating systems are installed.
My questions are:
1. Why I can't use the Thunderbolt display if I don't connect the MagSafe power which comes from Thunderbolt monitor to the MacBook? But it works with Windows7 while the MagSafe power isn't connected to the MacBook.
2. If I have to connect the MagSafe power to use the Thunderbolt display with MacOS Lion, is it harmful for the battery in the MacBook Pro? (I mean overcharging).
Thank you very much.
Sincerely,
Selcuk Kiray

As Kappy said Windows has no power management capabilities for Mac. Secondly Your MagSafe Adapter and battery has been built so that it knows when it's fully charged. After it's charged, it will then become a power cord until, you un-plug it, use up the battery and need to charge it again.

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Hello, benburn.
Thank you for visiting Apple Support Communities.
Here is a troubleshooting article that I would recommend going through when experiencing this issue.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
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<http://support.apple.com/kb/HT3131>

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Hi Steve,
I have had the exact same issues after adding a WD Thunderbolt Duo external drive to a Mid 2011 iMac and then daisy chaining the Dell U2410 monitor off that.
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http://www.ebay.com.au/itm/3-in-1-Mini-Displayport-to-HDMI-with-audio-DVI-DP-ada pter-3in1-convertor-Macbook-/110861703462?pt=US_Audio_Cables_Adapters&hash=item1 9cfdf5926
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I kind of figured this out. The reason I wasn't satisfied was that without the power adaptor when you hit a button on the keyboard the monitor actually wakes up the computer, works fine for a few seconds and then puts the computer to sleep. That kind of proves that it does work, technically at least. The problem is going into sleep mode afterwards.
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Top of the Line?
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Concerning this comment:
I know that neither the adapter nor the VGA cable have a problem since I connected the computer to my 1080p TV and it worked just fine...
I would like to point out that 1080p has a lower pixel clock than will 1920 x 1200. So it could be the stability problem is only present when the pixel clock is at the high end of the range.
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