How do i make an external monitor the primary monitor in XP using Mac OSX boot camp?

I have the new June 2009 Macbook pro.  I'm running XP using bootcamp with the new cinema display attached.

At the moment the laptop screen is the primary screen and the cinema display is a second screen, which works fine.

I would like to play games on the cinema display but i order to do so i need to make the cinema display the primary screen.

When i go into display properties the tick box that i need to use to do this, "make primary screen" is greyed out and i cant click on it.

How do i get this to work?

Thanks
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WolfAsked:
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pheidiusCommented:
To rule out out separate out drivers and/or resolution issues try to set the cinema screen to be the only display(no vid at all on lappy scrren). If it displays as such then check and report back on the working resolution.
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WolfAuthor Commented:
I set the cinema display to be the only display and that works fine, im happy to just use that one

Cheers
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