I built a small sample application that demonstrates one way of building a navigation bar in Flex 4 that makes it really easy to toggle between different views in an application. This approach uses spark RadioButtons with a very simple custom skin.
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DataGroup is a new component introduced in Flex 4 that is responsible for turning data items like Strings and Objects into visual elements. The process of turning boring old data items into a visual representation is called item rendering. DataGroup is the lightest weight component that deals with item rendering. It has no skin and no concept of selection. A SkinnableDataContainer is exactly the same as a DataGroup except it has a skin and a List provides selection functionality.
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