Create a Bidirectional Binding with Binding tag

            
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:s="library://ns.adobe.com/flex/spark">
    
    <mx:Binding source="input1.text" destination="input2.text" twoWay="true" />
    
    <s:VGroup>
        <mx:Label text="From Input 2:" />
        <mx:TextInput id="input1" />
        <mx:Label text="From Input 1:" />
        <mx:TextInput id="input2" />
    </s:VGroup>
    
</mx:Application>

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Create a Bidirectional Binding with Binding tag : Data Binding « Data Model « Flex

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