The Parts window (ctrl+w) can get a little tall on some of the more customizable vehicles. On a 14" monitor, it easily takes up the entire height of the screen. The "Done" button will be to far down to reach, and there is no way to exit the window. A scroll bar or 2 column option would help much. Also it would be a good idea to be able to hit (ctrl+w) again to close the window automatically
This is a known issue, and will be fixed soon (hopefully). For the moment, the "X" in the top right corner can be clicked to make the window go away.
The x is also covered by the top of the screen... just on the Gavril D series so it's no major threat
