john, the file should have bg clockflaps, with a dotted line straight across and then on the right edge are your icons. You're not seeing this in manila editor because the program background is white. So you can export to png and then edit and reimport..but with manila editor I always end up with my import being off sided... so.. try using Chainfire's gui editor, it works great on exporting and importing graphics (without sizing issues like manila editor) AND.. as a bonus you can change the preveiw background within the program so you can actually see those white graphics. Additionally, you can compress and/or decompress the files.. (right now the compression portion is not working for sprint stock manila).. .so if you get files that are compressed and want to use them with a stock sprint.. you can decompress them in one step and use them on your phone (IE: the cab file ruskiyab posted is compressed..can extract files and decompress). Chainfire's editor is here....
http://forum.xda-developers.com/showthread.php?t=470798