Flex 4 SDK - backwards compatible?

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So for the last few weeks I have been trying to get our current Flex 3.5 SDK to the new Flex 4 SDK. Wow. Backwards compatible? Not really.

After much annoyance and code changes, I finally got it working and running without run time errors. Now there are lots of things wrong visually mostly with the fonts.

What I am discovering is that the CSS inheritance seems to be lost. For example, if I have a VBox that has its color style set to white, its children are not white. Not sure what is up with that. So in my Application style tag I had the font family set... but it's not picking up on all the components inside the application, which means there are lots of problems with labels being too large and not fitting properly.

So now I am messing with the CSS files and the component files.

So far my take on the backwards compatibility? It's barely there. I mean everything functions okay (once you get all the initial errors and warnings cleaned up) but there is going to be a lot of work visually.

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