Use button click event to update Label text

        
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical">
  
  <mx:Label id="myLabel"/>

  <mx:Button label="Click Me" click="myLabel.text='You clicked the button'"/>
  
</mx:Application>

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Use button click event to update Label text : Button Event « Components « Flex

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