I've tried customizing regular skins (Button_upSkin, Button_overSkin, etc.), looks and feels pretty straightforward. But can I create custom skin bundles and use them for my custom control elements? Let's say I have four different button types, each of which requires it's own custom skin (bitmap), what should I do in this case (I'm very new to flex so please forgive me if that's a dumb question )? Should I somehow bundle all the graphics into a skin, or I should go styling way? I do not know whether I can use bitmap's as a background image for a button state, can I? Any good resource on the topic?