<?xml version="1.0"?>
<s:VGroup xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" paddingTop="20" paddingLeft="20" paddingRight="20">

  <s:CheckBox id="cb" label="Check me!"/>

  <s:Label text="{cb.selected ? 'checked' : 'unchecked'}" paddingTop="20"/>

</s:VGroup>