Having recently downloaded the Commander 114 and I have found the aircraft to be one of my favourites.I have been unable to activate the Autopilot Selector knob to any of it's five positions, in spite of reading the instructions. The knob is set on the 'Hdg' position, but if I want to fly on auto, I cannot select 'Nav'.

Contrary to what is written in the documentation, you can actually turn the knob with the mouse wheel.