Maybe I'm just using it wrong but it seems like ``setExtentAnimated`` does not work at all - at least the following example doesn't.

```javascript
var m = new lively.morphic.Box(rect(10,10,99,99));
m.setFill(Color.red);
m.openInWorld();
m.setExtent.bind(m, pt(200,200)).delay(1);
m.setExtentAnimated.bind(m, pt(300,300), 1000).delay(2);
```