draggin and avoiding snapping

Hey Guys,
I am studying the dragging objects example here http://developer.anscamobile.com/content/drag-me and I can't seem to understand how it avoids snapping. I have identified the code section where it says "relative to initial grab point", but I think I am missing something because I can't seem to do it in my own code. Any help would be really appreciated, thanks so much!
SM

views:1332 update:2011/10/18 15:01:22
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