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Synchronize TextInput and TextArea with data binding

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">     <mx:Script>                      [Bindable]             private var bindableText:String = "";            </mx:Script>     <mx:VBox>         <mx:TextInput id="input" />         <mx:TextArea text="{input.text}" id="area"              height="{(Math.round(input.text.length/40)+1) * 20}" wordWrap="true"/>     </mx:VBox>     </mx:Application>