How do I remove a callback for tokeninstance.onDragEnd?

[SilentRuin]

Actually this question is for any of the callbacks in Token and tokeninstance - how do I unset them? For example...

tokeninstance.onDragEnd = myfunction;
or
Token.onDrag = myfunction;

How do I remove those settings in runtime? Experimentation seems to show that everytime I add one in - it will actually add it in as if its a list - and call it multiple times. I know how to push an entry onto this callback list as shown above - how do I pull off something in these callback lists?

[Moon Wizard]

You can not remove a callback from global handler registration.

Regards,
JPG