Flash Builder 4 is suggesting mx1 instead of mx! why?

I just bought and installed the Flash Builder 4 after having the Beta for a while. The same code is giving me compile-time errors and suggests using mx1 instead of mx! If I make it mx1 the compile error goes away. Here is the top of my component:

<s:SkinnableContainer   xmlns:fx="http://ns.adobe.com/mxml/2009"

I mentioned nothing about mx1.


I used:


instead of:


and it worked.

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