[Digital Jedi]

There is no one way to design a style in Photoshop. Photoshop is just for fleshing out your ideas to see what the final product might look like. You can do that anyway you want. Once you go into making the style happen though, Photoshop doesn't serve any more purpose other than as a reference and for designing the images your going to apply to it. For example, someone might do a scale representation of their postbit and just cut the buttons from that image as the base for the real ones, or they may just use that as a reference and make large Hi Res buttons separately that they'll scale down later. It's really up to you what to do with it.