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Get Item index for a ComboBox

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"     initialize="initData()">     <mx:Script>                  import mx.collections.*;         public var myArray:Array = ["A", "B", "C", "D", "E", "F"];                  [Bindable]         public var myAC:ArrayCollection;         public function initData():void {             myAC = new ArrayCollection(myArray);         }         public function changeCollection():void {             var addedItemIndex:int=myAC.getItemIndex("B");                          ta1.text =String(addedItemIndex);         }            </mx:Script>     <mx:ComboBox id="myCB" rowCount="7" dataProvider="{myAC}" />     <mx:TextArea id="ta1" height="75" width="300" />     <mx:Button label="rearrange list" click="changeCollection();" /> </mx:Application>