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Bind TextInput to ArrayCollection with BindingUtils

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">          <mx:Script>                      import mx.binding.utils.BindingUtils;                          public function doBinding():void              {                 BindingUtils.bindProperty(myTextInput, "text", myAC.getItemAt(0), "author");                             }            </mx:Script>          <mx:Binding source="myAC.getItemAt(0).urlData" destination="myLabelDest.text"/>          <mx:ArrayCollection id="myAC">         <mx:source>         <mx:Object urlData="http://a.com" author="a"/>         <mx:Object urlData="http://b.com" author="b"/>         <mx:Object urlData="http://c.com" author="c"/>         </mx:source>     </mx:ArrayCollection>     <mx:Label id="myLabelDest"  text="prova" />     <mx:TextInput id="myTextInput" text=""/>     <mx:Button label="BindingUtils" click="doBinding()" />          </mx:Application>