Implementing Two-Way Bindings

            
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
    <mx:TextInput id="oneTextInput" text="{anotherTextInput.text}" />
    <mx:TextInput id="anotherTextInput" text="{oneTextInput.text}" />
</mx:Application>

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Implementing Two-Way Bindings : Data Binding « Data Model « Flex

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