Copying here code that i've daone in getting a country combo box.It is given as array collections..Chk if it can solve ur problem
public function loadCountryCombo():void { if(flag1) { var object:Object; if(model.userInfo.countryId! = null) { cntryId = new Array(); cntryName = new Array(); cntryId = model.userInfo.countryId; cntryName = model.userInfo.countryName; for(var i:int = 0; i< cntryId [0].length;i++) { object = new Object (); object.data = cntryId [0][i]; object.label = cntryName[0][i]; countrydata.addItem (object); } flag1=false; } } }