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This page has tables about Flex 3 MX components and their Flex 4 Spark counterparts as well as Flex 3 classes with no direct Flex 4 counterpart. Could anyone share the same for Flex 4 and Flex 4.5? The nearest I can find is New Spark components in Flex 4.5 SDK at page Introducing Adobe Flex 4.5 SDK but not in table form. Comparing 3 versions side by side in table form is most appreciated.
In Flex 4; Adobe introduced a new architecture for building components. This architecture was designed to help make skinning and styling easier. It introduced a two class architecture, separating the business logic from the display logic.
The page you link to is really comparing the MX/Halo architecture components with the Spark architecture components. More info on the architecture differences.
It is important to keep in mind that the MX/Halo architecture did not go away. It still exists in Flex 4 and can be used in conjunction with Spark components.
I would have sworn there was an explicit table somewhere in the docs talking about component differences between spark and Halo, but I can’t find it. The best I can recommend to you is to read through this section of the documentation.