I want to change the fader caps on the FX Chains, but iun the customise GUI option these are greyed out. I added a cap to the fade of the same size, but ithat didn't help
 
Background Colour, Preset Background image, preset text color, and Label Colour all work fine.
Fader, button and rotary are greyed out
 
EDIT
Some of the controls you could edit under the FX chain customise option is now dealt with from Theme Editor.