A few times a day I update my subversion checkout of the Gumbo trunk. Last night I noticed a major overhaul which renamed all the Flex 4 classes, repackaged them into the mx package instead of flex. The new classes are now all (at least temporarily) prefixed with Fx, so if you are trying to compile your previously working Flex 4 code against the up-to-date SDK and suddenly see the following error:
Error: Could not resolve <Application> to a component implementation.your issue will be resolved by changing Application to FxApplication. You’ll need to do the same for most of the other Flex 4 controls (Group, VGroup, and HGroup are exceptions that don’t need to be prefixed with Fx).
Spark Theme
You may also notice the new spark folder added in the skins directory. Below is an example application showing what these new skins look like for some of the Gumbo components:
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