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Get data frolm ArrayCollection by using index and property name

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"   layout="vertical"   creationComplete="myAC = new ArrayCollection(myData.book);">   <mx:Script>                  import mx.collections.ArrayCollection;             [Bindable]             private var myAC:ArrayCollection;                       </mx:Script>   <mx:Label text="From ArrayCollection : {myAC.getItemAt(0).title}" />   <mx:Model id="myData">     <rootTag>       <book>         <title>Java</title>         <author>rntsoft</author>       </book>       <book>         <title>Flex</title>         <author>Flex2</author>       </book>     </rootTag>   </mx:Model>   <mx:Label text="{myData.book[0].title}" /> </mx:Application>