Set item at third position to new value

           
<?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 index4Item:String=String(myAC.getItemAt(4));
            myAC.setItemAt("R", 2);
           
        }
      
    </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>

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Set item at third position to new value : ArrayCollection « Data Model « Flex

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