Scriptaculous - End Drag event exist?

Im using Scriptaculous to perform sorting on my objects using:
Sortable.create(). Im able to drag drop the item but i have because i
have an onClick event for each item that is draggable, the click event
is called once the user does a mouse up event. I want to prevent this
but i require the scriptaculous event which informs me when the drag has
ended. I noticed an endDrag() for Draggables but dont see how to get
access to this callback function.

Any ideas?