Flash XML menu,I need some help

1

I need some help, I was studying some tutorial ones, articles, and I made a menu with xml, it is works normal, what I need and I do not obtain to make no way, it is create sub menus, when I click in a button, appear the menu under, and when I click in one another menu, a menu go up and the other goes down, equal to one drop down menu.
my Actionscript.

 
[color=#000084]System[/color].useCodepage =[color=#000084]true[/color];
[color=#000084]var[/color] menuXML:[color=#000084]XML[/color] =[color=#000084]new[/color] [color=#000084]XML[/color]();
menuXML.[color=#000084]ignoreWhite[/color] =[color=#000084]true[/color];
menuXML.[color=#000084]load[/color]("[color=#0000ff]menu.xml[/color]");
[color=#878787]//Declaring the function
[/color][color=#000084]function[/color] montaMenu() {
		[color=#000084]var[/color] menuBot:[color=#000084]String[/color] = "[color=#0000ff]itemMenu[/color]";[color=#878787]//Linkage
[/color]	 [color=#000084]var[/color] posX:[color=#000084]Number[/color] = 0;[color=#878787]//Position X
[/color]	 [color=#000084]var[/color] posY:[color=#000084]Number[/color] = -20;[color=#878787]//Position Y
[/color]	 [color=#878787]//We create a for, that it will create an item in the menu for each valeu of the XML
[/color]	 [color=#000084]for[/color] ([color=#000084]var[/color] i=0; i<menuXML.childNodes.[color=#000084]length[/color]; i++) {
				[color=#878787]//We create 2 0 variable that will contain the values of the attributes of xml (titles and URL) so that let us can have access these values through these variable
[/color]			 [color=#000084]var[/color] titulo:[color=#000084]String[/color] = (menuXML.childNodes*.attributes.titulo);[color=#878787]//The value of the variable title will be the same of the attribute title of xml
[/color]			 [color=#000084]var[/color] link:[color=#000084]String[/color] = (menuXML.childNodes*.attributes.[color=#000084]url[/color]);[color=#878787]//The value of the variable link will be the same of attribute URL of xml
[/color]			 [color=#000084]this[/color].[color=#000084]attachMovie[/color](menuBot, titulo, i+10);[color=#878787]//We annex the MovieClip "itemMenu" in _ root of the movie, the new name of it will be the correspondent the variable title, that title of xml. contains the value of the attribute i+10 is the value of added i the 10 that will be the level of the MovieClip in the stage
[/color]			 [color=#000084]var[/color] item:[color=#000084]Object[/color] =[color=#000084]this[/color][titulo];[color=#878787]//We create a new object. [ ] has the same function that eval(), with the difference that the eval cannot have access valore of the object and properties.
[/color]				item.tituloItem.[color=#000084]text[/color] = (titulo);[color=#878787]//We define the value of the text tituloItem of the item
[/color]				item.[color=#000084]_x[/color] = posX;[color=#878787]//We define item position X being equal of the variable posX
[/color]				item.[color=#000084]_y[/color] = posY += (item.[color=#000084]_height[/color])+1;[color=#878787]//We define item position Y being equal of the variable posY = posY +(height of item)+1
[/color]				item.link = (link);[color=#878787]//We define the value link to the object item
[/color]			 [color=#878787]//onRelease
[/color]				item.[color=#000084]onRelease[/color] =[color=#000084]function[/color]() {
						[color=#000084]getURL[/color]([color=#000084]this[/color].link);
				};
				[color=#878787]//onRollOver
[/color]				item.[color=#000084]onRollOver[/color] =[color=#000084]function[/color](){
						[color=#000084]this[/color].[color=#000084]gotoAndStop[/color](2);
				}
				[color=#878787]//onRollOut
[/color]				item.[color=#000084]onRollOut[/color] =[color=#000084]function[/color](){
						[color=#000084]this[/color].[color=#000084]gotoAndStop[/color](1);
				}
		}
}
 
menuXML.[color=#000084]onLoad[/color] =[color=#000084]function[/color](ok){
		[color=#000084]if[/color](ok){
				montaMenu();
		}
}

my XML.


<?xml version="1.0" encoding="iso-8859-1"?>
<item titulo="Home" url="http://www.2centavos.com.br"/>
<item titulo="Principal" url="http://www.2centavos.com"/>
<item titulo="Dúvidas" url="http://www.2centavos.com.br"/>
<item titulo="Produtos" url="http://www.2centavos.com.br"/>
<item titulo="Contato" url="http://www.2centavos.com.br"/>

I´m put for download.
In this way the menu works normal, without the sub menus.
sorry about me English.