Can I add my own buttons to a skin?

Yes, you can create your own buttons. A button can consist of text or graphic. Each button can have up to four different states (normal, roll-over, pressed and inactive), which should be presented by different images in case you want your buttons to be graphical. When creating a button you will therefore be asked to select the kind of behavior (play, stop, mute, previous,next, show/hide panel etc.) and – in case you selected a graphic button – the four images for each button’s state. See tutorial.