HorizontalButtonBar does not appear to display disabled buttons with the correct colour backgrounds

[eviltofu]

While debugging, changing the inactive background to green does not show green buttons. This means the inactive button background is not working.

            static let primaryButtonBackgroundInactive = UIColor { trait in
                return colorFrom(trait: trait, lightColor: R.color.mike()!, darkColor: R.color.green()!)
            }

            static let secondaryButtonBackgroundInactive = UIColor { trait in
                return colorFrom(trait: trait, lightColor: R.color.mike()!, darkColor: R.color.green()!)
            }

Button is disabled but the background image does not appear to be set correctly.