I just have one question. Which is very stupid. I build it and it worked fine. Everything is really cool. But When I build a big bar 500 pix long it only load 1/3 of it, while the percentage was going all the way.
There is a line of code in there that corresponds to the length of your loadBar. In the tutorial the loadBar is 100 pix which can be confusing b/c then the code makes it look like 100 is a %. You want to change this line of code:
this.loadBar._width = getPercent*100;
Change the 100 to the length of your loadBar (500 in this case)