Appdesinger Slider - can I reverse the direction?

I would like a slider that runs from 0 at the top to 100 at the bottom. I thought I would just under the covers reverse the value in the 'changed' callback and then reverse the tick labels. Quickly found out that the ticks are sorted to match the values, and the order I supply the tick labels in does not matter. I don't see a way to make the slider run backwards.