If you need to use a co-ordinate system, there's many workarounds if you're willing to do a little bit of extra programming...
Try developing some kind of auto-aligning system, with top/bottom/left/center/right alignment flags. That way, you can specify a graphics item to be aligned with the bottom of the screen.
Another method is to use a virtual co-ordinate system, like 1000 by 1000 pixels, and scale gracefully to the BlackBerry resolution. So Pixel position (500,500) translates to the center of the screen.
One of the things I developed with my home theater career, was a virtual co-ordinate system for resolution-independent user interface displays, so I am pretty experienced with using co-ordinates gracefully on displays of unpredictable resolution...
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