If you don't want to mess with the stylesheet, you can include everything in the <Button> tag.
code:
<Button cmdid=7460 id=atom(SkinOpsbtn) AccName="Name Here" accdesc="Tooltip here" AccRole=57 Class="TransparentButton" Layout=flowlayout(0,2,0,2) Active=MouseandKeyboard|NoSyncFocus Padding=rect(5,4,5,4)>
<element class="ToolbarIcon" content=rcimg(New Image ID)/>
</Button>