No LIVE COMPASS CALIBRATION 3.64

I uploaded 3.6.4 arducopter firmware on my pixhawk. However i cannot find the live calibration button in mission planner. I have the latest MP installed. Anyone knows why?

Press & hold the CTRL key, while clicking compass in mandatory hardware to get the live calibration menu.

it has been removed as it is recommended to use the on board calibration, it more accurate.

Thanks so much. Do u use the live or onboard for calibration?

I use onboard calibration using stick gestures.
http://ardupilot.org/rover/docs/common-compass-calibration-in-mission-planner.html#common-compass-calibration-in-mission-planner