There is an entire section dedicated to this topic in the documentation.
http://www.gaiaflashframework.com/wiki/index.php?title=Preloader#Overriding_The_Preloader_At_RuntimeInstead of attacking Nemo by calling him a "weirdo", consider that 1) he is giving his own free time to help, 2) English is his second language, and 3) that he at least tried to answer a question already answered in the documentation, which normally get no answers or a "Read the documentation" answer. From the looks of it, it appears to me that he was answering the question based on the assumption that the documentation was already read.