Locking screen resolution in XP

[trooperiziz]

My laptop has a screen resolution of 1440x900, my external display has a resolution of 1440x900, yet when I undock or dock my laptop all the applications and icons have been moved and resized as if the screen resolution has dropped to 800x600 at some point. Even though both stay at 1440x900 as far as i can see.

Any way I can lock the resolution so that it never changes?