如何在Flex / Flash中可视化XML？

I'm making a Flex application to visualize the contents of an XML file in a tree, radial diagram, etc... I looked all over the internet and I can't find any useful tutorials or source code on how to do this. Most existing components on the web have licensing issues with them, so I prefer to write some sort of XML visualization algorithm from scratch.I'm making a Flex application to visualize the