I just installed the latest software, and I see that it now allows you to use the left thumb wheel on the steering wheel/yoke to control certain cell phone functions. I am connected by bluetooth. Sure enough, if I get a call while driving, I can answer by just depressing the thumb wheel once, and can adjust the volume by rolling the wheel up or down. My question is: how do I hang up when I am done with the call? Tried depressing the wheel twice, but no luck. If it is in the instructions somewhere, I just haven't been able to find it.