Great! The easiest thing to do now is find the cfc gui editor by chainfire.. the latest one even pulls the manila from your phone, so you can view, then change the graphic and reimport right back to your phone all via usb connection. This makes the overwrite, need for cab obsolete! The only rule to follow is to only use compression factor IF you manila can be patched (Sprint manila stock won't patch
) and always keep your graphic dimensions the same as the original.. .like this particular one was 256x64 even though I made it blank/empty/transparent, I had to keep it 256x64, if I had changed the size you would have had a white box instead!
Here is a link to that particular program: (wow, when I was looking up the link for you I see he's even updated the last version! I'm hoping this will let my sprint phone compress the graphics!)
http://forum.xda-developers.com/showthread.php?t=470798