Problem
Unfortunately Flex 4 does not have Spark Tree and MX Tree has 99 bugs at this moment.
Solution
Use Spark List-based component provided here.
Detailed explanation
In our project we were in need of Spark-based Tree for some time so inspired by
Alex Harui I wrote it:
View Source, download component source
Creating tree item renderers
Tree item renderers should extend
TreeItemRenderer.
Here is the default item renderer.
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