Resize a Keynote slide with Applescript

Hi, I'm trying for hours to resize a Keynote presentation in a window, but with no success.

I'm starting thinking that it's impossible..

With

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tell application "Keynote"

start

set the bounds of the window 2 to {0, 0, 800, 600}

end tell

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it doesn't work properly..

Is there a way to launch the slideshow and then change the rect (size and position) of the presentation to show, for example, the slideshow in a particularly part of the desktop?

Any hints would be appreciate...

Thanks