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Knowing when a Flex MX Tree component is done rendering the children

I have a component in Flex Builder, and the dataprovider to this Tree is a ArrayCollection.

I update the ArrayCollection dynamically, and the Array can become really big.

What I now really need to know is when Flash is done rendering the Tree component, is there som Complete event that triggers when the Tree is ready, or some other way for me to know?

My problem is that a event handled by my code can triggers a re-render of the Tree while the Tree is still rendering the last update.

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