Enyo 14080 derekanderson

Corrects behavior with Moonstone Panels for BHV-14080

Updated Post and Pre transitions stages, to ensure panels move without animating.

Enyo-DCO-1.1-Signed-off-by: Derek Anderson <derek.anderson@lge.com>
I think we might want to use `_setIndex` here so that we notify any observers to the change in index.