Histogram and White Balance

[IndyP]

Hi Everyone,
  I've just read an article on how to set Custom White Balance (CWB) using the color Histogram. Apparently, it should be done with multiple histograms instead of a single one. I believe (and I could be wrong), that a few years ago I was able to view several Magic Lantern Histograms on the LCD screen but I can't find a way to do this in the Histogram sub-menu.
  Can magic Lantern display multiple Histograms on the LCD screen (one for each color channel) and if so, how do you bring them up?

Thanks