I will tell you what typically happens in the area I work in:
The cabinet installer installs the cabinets with the lighting semi flush mounted, drills a hole in the bottom of the cabinet horizontally towards the back. Then runs the wire through the hole so that it hangs at the bottom, rear of the cabinet. It is usually too short to reach your 120 switch leg, so you may have to splice to lengthen it. Then you run the wires to an accessible point where they connect to a transformer that you are switching. Usually they are 10 watt halogen, at 12 volts. So you will probably have to do some fishing to get the low voltage wires to the transformer location.
