Bind to a Property 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="nameInput.text.length + ' letters.'" destination="nameOutput.text" />
    
    <mx:Panel title="Data Binding Example" width="300" height="300">
        <mx:Label text="Enter name:" />
        <mx:TextInput id="nameInput" maxChars="20" />
        <mx:Label text="You entered:" />
        <s:RichText id="nameOutput" />
        
    </mx:Panel>
    
</mx:Application>

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Bind to a Property with Binding tag : Data Binding « Data Model « Flex

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