sprite help

[<gzahoransky-kohalmi AT salud.unm.edu>]

Hello List,

First of all I'd like to say thanks for your effort to create this great graph
visualizer!

I'd like to ask your help in three questions related to handling sprites.

1. Can I make the sprites non-clickable so that users can't move them around?

2. Can I reset (re-position to edge) sprites in the case user incidentally
drags them away from their edge?

3. Can I make sprites hide and reappear (at the respective edge) upon user
initiated event (e.g. mouse click)? I tried using the detach method of sprites
but that put all the sprites on top of each other, but I could not make them
disappear. I also noticed that in the case of moving a sprite away from its
edge, then doing the detach-reattach cycle the sprite won't appear at the
original edge but somewhere else.

Any help would be greatly appreciated!

Thanks,

Gergely