Wiring Question - Rheostat and Rocker switch in series, lights are still on?

[Snaz]

I am wiring a DIY LED fixture and my goal is to use rheostat(dimmable driver) and a rocker switch in series so that I can switch off the lights completely with the rocker switch and dim with the rheostat. The rheostat alone does not dim to zero hence the rocker switch.

When I put the rocker in the off position switches the LEDs do not completely extinguish, same as if the dimmer was turned to minimum.

Three post 25ohm rheostat and the rocker is the existing switch on the Biocube hood. How can I wire this please so I can completely turn off the lights without unplugging from the wall? Thank you.