Tweener Documentation
AS2 and AS3.
... onOverwrite:value, ...
value:Function — A function that is called when tweening is overwritten. It is called once regardless of the number of properties involved on the tweening. The function scope is the target object itself.
// Applies two tweenings on a movieclip, warning when the first is overwritten (AS2)
onOvr = function() {
trace ("A tweening has been overwritten at " + this);
};
Tweener.addTween(myMovieClip, {_x:100, time:1, onOverwrite:onOvr});
Tweener.addTween(myMovieClip, {_x:50, time:1});
The reference passed to this property is a reference to the function only. This roughly means you do not use any kind of parenthesis or parameters when passing the function you wish to call - you need to use the onOverwriteParams parameter for that. See the onStart method notes for more information and examples.