Stick with flash pro or move to flex?

[h=1][SIZE=2]As a career I think I want to be a programmer. I started programming with actionscript 3.0. I bought a book and learned a little bit from that. I then decided to make my own flash game and I just finished it yesterday :stuck_out_tongue: My plan is to get good enough with actionscript 3.0 and then move on to Java. Basically just getting as much programming and game making experience as possible. My question is when should I continue to make games in flash pro or learn how to use flex?(I have flash builder 4.6 for free right now since I’m a homeschooler :P) Are most of the flash games on like addicting games made in flash pro or flex? Even if you think I should stay with flash pro until I get a little better do you think I should eventually move to flex?[/SIZE][/h]