I will not let a 3 year old control what I watch.
I've agreed with everyone, but I had to laugh at this statement! I swear I haven't watched what I wanted for 16 years now. Just tonight I wanted to watch "Cougar", but I had noplace to watch it where the kids wouldn't be able to see it too. My kids totally control what I watch - but only because I have want my kids to have higher standards in their tv watching than I'd secretly like to have!

but I didn't mean she literally has the channel changer and we don't take it away from her. I just meant that she has a strong attachment to tarcoons. We are turning it off and making her do other things. But we don't want to spank her when she screams because Max and Ruby isn't on. Was just wondering what some of you do. Now all of a sudden I have a big urge for a firehouse sub. 

You definitely don't want to spank over cartoons, that won't help. Just be firm with her and distract her. She is too young for any other kind of punishment besides turning off the tv and putting her in time-out.