Use a static constant as the source for a data-binding expression

            
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
  <mx:Script>
    
    public static const constString:String="A static const.";
  </mx:Script>
  <mx:Button label="{constString}" />
</mx:Application>

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Use a static constant as the source for a data-binding expression : Data Binding « Data Model « Flex

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