Movement key won't work with preloader

In flash mx sample fla, there’s a file called movement keys where when we click the directional button, the key will go down. but when i add a preloader to that file, it is not functioning right, why? how to make the same effect if i want to add a preloader to it?
Refer to the file i attach if needed
Thanks!

seems nobody wish to look at my question, is it because the subject is unattractive?
but i need you guy help, pleasse!
THNAX again.