That's why I attached the link:

Previously, with ActionScript 2 when you used an Object as a key/value map you could always iterate over the values in a predictable order using the for...in loop construct. In ActionScript 3 there is no longer a guarantee as to the order that properties of dynamic objects like Object and Dictionary will be returned. If a developer requires a predictable order for iteration then a custom collection class must be created. Below is one example of a class that provides this functionality.