How to change color for table header?

I still haven't found a way to change a headers' colors in a table. How can I do it?

[rubyFeedback]

Do methods such as setBackColor(FXRGB(255, 255, 255)) or setCellColor(0, 0, FXRGB(255, 255, etc... work?

I think I saw some other examples that are similar ...

May be better fox FOX to transition into CSS and allow styling of any widget; GTK sort of went that route.

[rubyFeedback]

Just to clarify: I struggle finding documentation myself. ;)

I am slowly working through the old "Create Lean and Mean GUIs with Ruby". I
guess fxruby is limited in what upstream fox supports. Classical GUIs took a
huge hit with the www becoming so dominant. It's weird because I think ruby
is more fun than javascript.