Fixtures with multiple intensities/attributes

Question

So, I've been trialling some LED "bar" type fixtures, but can't work out how the UI is accessed to change the intensity/colour of different parts of the same fixture. 
 
 In this case, I have some Showline SL Bar 640 fixtures, which can be addressed as 12 separate units, but when I select them, I get a single intensity and colour control. I guess I'm missing something obvious...can someone tell me where and how I work with those 12 parts separately? 
 I've doubled checked that both the fixture is in 12-group mode and the personality used is the SL Bar 640 RGBW 16B 12G one.

ueliriegg · Accepted Answer

you didn't miss anything obvious, that's currently not possible. 
 to be more precise: there's only one color picker per channel, so if you want to use Red/Green/Blue, Red2/Green2/Blue2, Red3/Green3/Blue3, ..., you can use the encoders or ML Controls, but with color picker you will always change the first cell. 
 the usual work around is to use one channel per cell.