(Note: The screenshot shown may be different to the current version of EOD).
With the "up" and "down" buttons, the order of objects can be set. This can be important if
FS200x
extended bitmaps are used. It's meant to solve problems with disappearing
objects when you use semi-transparent textures.
You can E-Mail me if you have any further
questions about extended bitmaps and the order of objects.