clsfloatingwindows problem

I am using Informatix's puzzle version of his demo (the 9 square matrix).
I am trying to slide a tile from its original position to the adjacent tile and get them to swap their position.
This means I have to detect the movement of the tile, which I can with UnDock.
But I can not see how to swap the stickyedge addresses so that when the animation begins they will change places.

Can anyone help.

from B4X Community - Android, iOS, desktop, server and IoT programming tools http://ift.tt/1qXxeRQ
via IFTTT