You can't "control your dreams."
You can control your own behavoir in an LD, but no more than you can control it while you're awake, and usually even less than that.
Someone sent me a PM recenty that claimed I was "ruining his life" by coming here and saying that.
Wow. I have to wonder about the kind of life that person is leading.
There are things you can do in LDs though that are a lot better than "controlling" them, and infinitely more useful than bullshitting strangers on the Internet about your prowess in dreaming, and than in getting in the way of real learning.
http://tech.groups.yahoo.com/group/luciddreamingtasks/[/b]