The event framework or EventListeners in ActionScript 3 is one of the best features that AS3 has, here a some tips and tricks that I have found very usefully.
Useing WeakReference:
In AS3 objects gets garbage collected if there are no references to them. If you remove your object where an event listener is added but if the object is still being referenced somewhere else it will not be garbage collected given you the possibility of having memory leakage (strong memory references). If you set your event listener with weak memory references the event listener gets garbage collected when the object it’s added to gets removed.
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Some time ago I had the opportunity to write a beginners tutorial for the 
