How to select items with selectedItem and selectedIndex?

Hello.
I'm trying to selected and item in both a dropdownlist and combobox using selectedItem or selectedIndex properties. They don't work
Browing internet I found a lot of people with the same problem, that was already know in 2008.
The easy commands ddcompontent.selectedIndex = value or ddcomponent.selectedItem = item don't work.
Can anyone help me?
I couldn't find any solution.
thank you
Pbesi

Without seeing your code it's hard to tell where you are going wrong.
I have comboboxes which I need to set to the last value selected.
I wrote a function like this, and it works fine for my needs. Given you know the value you want to select. if you know the index of the item already then you should just be able to set that.
private function setCmb(cbx:ComboBox, val:String):void
var arrC:ArrayCollection = cbx.dataProvider as ArrayCollection;
for (var i: int = 0; i < arrC.length; i++) {
var pe:String = arrC.getItemAt(i) as String;
if ( val == pe) {cbx.selectedIndex = i;
break;}

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How to select items with selectedItem and selectedIndex?

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