Even if I put a null componet and remove parent... again for important to remove event listeners?

I'm confused about something. My Essential Action Script book mentions that you should really remove all registry event listeners when you use is no longer the component when it is defined. It applies even if its parent container is removed and you set the null object? The garbage collector should not take care to destroy the event listener registered as well since it was registered in the component that you have set to null?

When you set a component to null, what you are defining this particular reference to null, is no no not the object itself null. The event listener maintains a reference to the component, and given that the number of references so that the object is greater than zero, it is not the garbage collector.

You can work around this problem by setting the useWeakReference flag in the call addEventListener() to true. Be careful with this, however. If you use a weak reference, and do not remove the event listener, you can always react to events lifted between the time when it is removed and when he is recovered by garbage collected. It is generally safe, but if there are events that are triggered by a timer, that could be a problem.

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