AlphaPicker with vertical direction is upside down

The vertical alpha picker has the 100% alpha point at the bottom, an 0% at the top, which is not a common convention, I needed to change this, I dont see a way to do it in the docs, Kindly update me on this, if its been added, or if there is a workaround to get this fixed,

The issue identifies the vertical AlphaPicker and reports that its alpha orientation is reversed. Begin by locating the AlphaPicker implementation and checking how vertical direction and any documented workaround are handled; done means the expected orientation is supported or the workaround is clearly documented.

Written by the indexing model from the issue text.