HOW Make dependents combobox or dorpdownlist's

Hello everybody, i need another help

i'm triyng to do the next in flex: using DropDownList or Combobox and Mysql DB, I
want select to a brand of a product, then a caracteristics and then a detail s of that brand ... and i want to make it using dependents combobox's or dorpdownlist's

I upload my project and i need help. is very important, please...

all that i want is made dependents combobox or dorpdownlist.
there are 2 links into megaupload:

Project : http://www.megaupload.com/?d=X6V25N8O
DataBase : http://www.megaupload.com/?d=T6TLI3OL

Please i need help this i have to finish this point to start with
another point.

Why to POST in english in a spanish Board?
There are not enough english Flash Boards where you can POST?
I suggest you http://www.flash-db.com/Board/index.php or http://www.ultrashock.com/forums/, both in English and a helpfull community.
Or you can translate in Spanish and repost, so all people in the community (and not only those who understand English) can share the problem and a possible solution.

Jorge

Kaltxì tute ta spain rutxe kä ne lahe tsenge fu plltxe mì lì'fya.