Combo Box Help

HI

ONe question about xml and combo's : how can I fill them via a xml file
An then triggering eacht choice to start a function for creatiing a new object
See my thread at : http://www.kirupa.com/forum/showthread.php?t=279646

When I use this :
import fl.controls.ComboBox;
import fl.data.DataProvider;

var dp:DataProvider = new DataProvider();
dp.addItem({label:"item 1a"});
dp.addItem({label:"item 2a"});

var myComboBox:ComboBox = new ComboBox()
myComboBox.dataProvider = dp;
myComboBox.move(10, 10);
addChild(myComboBox);


function test(event:Event):void{
myComboBox.labelFunction = nameLabelFunction;

}
myComboBox.addEventListener (Event.UNLOAD, test);



function nameLabelFunction(item:Object):String {
trace(item.label);
return item.label;
}

Evey change is traced but sometimes I get all the items... Any ideas??
Ciao

my mistake:

so i only have one layer on my timeline

the combobox's instance is dropdown

there must be somethin im missing!