Don't use the fill painter as that can draw unwanted visuals such as the specular highlights. Instead, RadianceColorSelectorPanelUI.paintCaptionBackground should do the same as RadianceCommandButtonPanelUI.paintGroupTitleBackground for consistent visuals across similar logical usages.
Don't use the fill painter as that can draw unwanted visuals such as the specular highlights. Instead,
RadianceColorSelectorPanelUI.paintCaptionBackground
should do the same asRadianceCommandButtonPanelUI.paintGroupTitleBackground
for consistent visuals across similar logical usages.