Printable View
As a workaround I use a large AO which is always set to front. Only the playfield area is cut out and filled with the transparent color. Of course, it's not very comfortable in Frame Editor if you need to put some backdrops outside the visible playfield.
Also JoKa your solution doesn't help when we place flash file in website and we don't want it to change the size - for example of the table - because it will destroy the site design.
Still I noticed that preloader (at least Image one which I'm using) is not scalable.