Help - Skinning a Button Component with a Bitmap


I’m working on a Flash game and I’m using button components in the UI. I like that the key functionality is built into them and that they are fairly easy to skin. The problem is, I need to be able to skin them with a bitmap (specifically a PNG) using AS3. I’ve found a couple of Flex frameworks out there that might help but we’re not using Flex in our development process. Does anyone know how to do this? Thanks.