Stand Alone Trim wheel

I managed to get my hands on a stand-alone trim wheel.

I having some trouble in setting it up. When i go to OPTIONS> CONTROLS> FLIGHT SIM SURFACES> Trim up or Down, I

don't know what to do. I can click on 12 boxes, but nothing happens.

The trim wheel does show up on the same line as the Keyboard and the Joystick, so it does recognize it.

 

Thanks

Being a trim WHEEL, I suspect it's an axis, rather than a button or keyboard control, just as a stick/yoke and a rudder are axes.