Once you delete the bitmaps, you can't overlap them, youd have a blank page! Though not sure as to how small you can make them, but if you look at the TV device pages in my .ncf file, you will see a few buttons I have "Hidden" this way..

Also, the new software is out! You will lose your .ncf file when you upgrade the FLASH!! Yet it has to be done first in order to Upload..