Using Flex instead of Flash

Can I setup the client to work with Flex as an ActionScript project? Or do I need it to be a CS3 project?

I ask because I prefer doing my ActionScript projects in Flex using an SWC to hold everything that isn't code.

In case anyone has the same doubt, it didn't pose any major problem, as expected. The only extra thing I did was change the default output folder for the client's SWF.

The only thing I find slightly annoying is that once I had the client running from Flex, the thing throws a lot of warnings.

Most of those warnings are missing type declarations. I know it's not really necessary, but it would be pretty cool if for coming realeases there were explicit type declarations where ever they are needed.

Future releases will have a special example project for flex. So stay tuned!

I would like to compile in flex 3 or 4 and run the local C# solution from that. can you help? Thanks. I have two singleplayer games done and am starting a multiplayer.