Packaging app icons

I'm trying to package my Flash Building app for iOS with custom graphic app icons, but having no luck--I'm only getting the generic white icons.  I've followed as best I can every tutorial I can find, and it seems pretty stright forward.  I'm made an assets directory for all required versions of the icon PNG files, placed that assets folder into the src, put the source path to each PNG file within the application XML file, and made sure that these assets are included in the Package Contents.  I've also tried packaging the file in both "fast" and "standard" modes.  No difference, I only get the generic white icons.  What else can I do?

<!-- <icon>                     <image16x16>assets/icons/SBLogo16.png</image16x16>                     <image32x32>assets/icons/SBLogo32.png</image32x32>                     <image36x36>assets/icons/SBLogo36.png</image36x36>                     <image48x48>assets/icons/SBLogo48.png</image48x48>                     <image72x72>assets/icons/SBLogo72.png</image72x72>                     <image114x114>assets/icons/SBLogo114.png</image114x114>                     <image128x128>assets/icons/SBLogo128.png</image128x128>           </icon> -->

Anyone have any insights?  Or have some links to very explicity references (most everything I can find is a bit vague).