Thanks Steven, but it's sorta, not quite, working the the right way
Its applying the alpha from <element id="Panel.CommandIconOverride" fg="180,147,81,148" />to the entire icon area, not just the visible parts of the icon.
IMHO, for such a minor tweak, lets revert to the previous "no alpha" version, and not worry about it.
Thanks again for taking the time to have a go at it