Most of this actually is related to Mobile development with AIR, considering there isn’t a bunch of desktop development focus in the SDK.
Adobe released an early version of Flex 4.5 (Flex Her0) just before Adobe MAX last year, and tons of people grabbed it and started writing mobile apps with it.
Since then, quite a bit has changed both in common functionality, and under-the-hood things like List scrolling.
I couldn’t find any clear documentation about migrating your applications, so I figured I’d try to throw together as much information as I could think of.
I will be updating this frequently as I find more changes or caveats while converting my apps, or from what I hear from others.
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While there’s plenty of information about skinning your Flex 4 component, I haven’t found a whole bunch of information on how to get them to talk together. In most situations I would consider this bad practice, however there is often a need for identifying properties set on your component from your skin in order to display certain aspects properly.
I recently was working on an application, and needed to listen to KeyBoardEvent dispatches from the stage. This isn’t usually that much of an issue, except when your component needing to listen to these Events is created as part of the application creation process.