Wrap the whole string with {} during Binding

            
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
  <mx:Script>
    
    public function aMethod():String {
      return "food";
    }
  </mx:Script>
  <mx:Binding source="{'The dog ate my '+ aMethod()}" destination="field2.text" />

  <mx:TextArea id="field2" />
</mx:Application>

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Wrap the whole string with {} during Binding : Data Binding « Data Model « Flex

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