C300 MkII Color Matrix (Green/Magenta)
 

Does anyone know how to adjust the color matrix on the C300 MkII easily? On the C100 it's fantastically simple using the white balance shift screen - you can move the joystick left/right to adjust the red/blue balance, or push the joystick up/down to adjust green/magenta balance. This is really useful. Is there a similar way to do this on the C300 MkII? There are white balance adjustment menus on the C300 MkII but they are very complex and seem to be more a case of increasing/decreasing various colours, rather than more simple balance adjustments.

Very often when filming I will enter the Kelvin setting that looks right in terms of red/blue, but often I want to tweak the green/magenta balance, but I can't find a way to do this easily on the C300 MkII. Any ideas welcome!

Matt