Flexponential

This post looks at a couple ways of defining a custom item renderer on a DataGroup, but it also applies the same way to a SkinnableDataContainer, spark List, and any other spark components that support item rendering.
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The spark List component in Flex 4 has virtualization enabled by default. Virtualization is an optimization that only renders items that are currently in view which allows the List to support very large data sets. You can learn more about how virtualization works in Flex 4 by reading the Spark Virtualization Spec.
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