There is a command <i>"ctrlSetBackgroundColor"</i>, but no command to change the color of a process bar during runtime (which is the "barColor[]" in a corresponding UI class).
I've missed it several times now and it would be really helpful to have a command <i>"ctrlSetBarColor"</i>.
Alternatively, it would be preferable to have other commands like <i>"ctrlSetBackgroundColor"</i> expanded in their functionality so they're usable for progress bars and other controls, too.