No Photoshop Brush Events. Is this Still Correct?

On my Plugin, I have 3 sliders to update the Brush Size, Opacity and Flow settings.

Changing any of these sliders does update Photoshop as expected but I would like the panel sliders to update if either the Brush Size, Opacity, or Flow was changed directly in Photoshop.

I have set up a Listener but it appears that none of the above are firing anything when changed in Photoshop.

Does anyone know if this is correct or have I missed something