Just like Alfresco, Flash and Flex project are so incompatible I don’t suggest to developing with it!
What a waste of time:
Man, I am trying Adobe Flash Builder 4. I have no idea what is what, but adding one piece of code into an mxml in Flash Builder breaks it. What a pile of poo!
The following breaks a standard Flash Builder 4 file.
FACEBOOK ACCOUNT and TWITTER. Don't worry as I don't post stupid cat videos or what I eat!