What are main differences between flash ActionScript and Flex actionscript? Why Flash can not compile AS files generated from Flex (with keep-as) directly?
Some problem is - I want to compile generated from MXML .AS files using Flash CS5... But it appears to me I can not... Why?
The reason is that there's a difference between Flex Builder (the software program you use to create Flex apps) and the Flex Framework.
The Flex Framework is a set of classes and components built on ActionScript that extend what's already there. Flex Builder has access to all of the code in the Flex Framework - Flash Professional does not.
That's why, for instance, the [Bindable] keyword doesn't work in Flash - all of the code that makes it magically work in Flex apps doesn't exist in Flash.
That said, they've come a long way towards integrating the two. Right now you can build a component in Flash CS5 and drop it into Flash Builder (they renamed Flex Builder to Flash Builder recently) and use it - but it's still not possible to take an .mxml file from Flash Builder and compile it in Flash.
I hope that helps, I know the distinctions can be tricky.