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    <p>Best practices with AS eventlisteners are:</p> <ul> <li>Make it weak (as you've done, the last parameter of addEventListener)</li> <li>Set the event listener to null after handling (strictly speaking not required if you have set it to be weak)</li> </ul> <p>Flex does not give you destructors. It has its own Garbage Collector running behind the scenes managing memory. It cleans up a piece of memory once there are no references to it. Well, strong references. All objects by default have a strong reference. Event handlers, since they tend to be a performance bottleneck, have this special ability of declaring themselves weak -- a weak reference. This is of course possible only when you are attaching the event handlers using the <code>addEventHandler()</code> function. Weak references are not taken into account by the GC and hence, when all strong references are gone, they'll be automagically garbage collected, freeing you from the tension of having to do a <code>=null</code> manually. Which is what you'd otherwise do when you don't specify the parameter. By default, even handlers are created as strong references.</p> <p>However, marking them weak has a side-effect. They can vanish into thin air without you ever knowing about it. Eventually, you will know, but in terms of a nasty bug. Is that what's causing your problems? Maybe, may be not. You'll have to experiment. Also, it'll help if you can provide us with some more detail like the exact error code, some source.</p> <p>Hope this helps. Happy flexing :)</p>
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    1. COcan you add an example? I'm new to AS3 and I really don't know what does weak mean.
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