Brooke is a great character and everything but

I'm not complaining I'm really not, I love Brooke to death and she is my absolute favorite character in the movie, I just don't understand why she is listed first on IMDB's credits when shouldn't the title character Alexander be listed first? If it is listed by first appearence that wouldn't make much sense either since she most definitely wasn't the first character to appear. I'm really just trying to figure out the logic here