Contrast keys in Key Editor : where to change?

Hi guys,

i checked everywhere, i cant find where to change the contrast of the black/white keys in keyeditor (cubase 7.5.)

Im coming from 5.5 so everything is new and confusing for me. (no 64bit 5.5 on mac)
What i would like is to see, is a white background with normal looking keys like on a real piano.
My key editor background is white, but the keys are very light grey so i cant see well

PS. Are there colour examples available online, or presets? There must be people with awesome colour schedules they would like to share!

thanks in advance!

Cubase 7.5
OSX 10.8
Macbook Pro