title: Circular NSSlider with stop (non-continuous)
body: <p>I am not sure how to phrase this better as a title but I need to make an NSSlider that functions as a normal volume knob.  At the moment it will spin around as many times as I hold the mouse down and move it around the control.  I need it to stop at the "0" position and the "100" position, I cannot have it jumping from 0 to 100 when I drag it the other way.  I hope I am making this clear.  Does anyone know how to do this or have any suggestions?</p>