Help with [Bindable]

[grande]

Does the event fired when something is bound only fire when an equal sign is used?

For example, this doesn't cause a re-bind:
ValueObject.BoundArrayCollection.addElement(newElement);

But this does:
var array:ArrayCollection = ValueObject.BoundArrayCollection;
array.addElement(newElement);
ValueObject.BoundArrayCollection = array;

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Call me barely Impressive Captain.