This application is without problems with Flex3 but Flex4 throws compile 
exception: 1120: Access of undefined property myXml. Problem is binding 
'enabled="{a}"'. 

Source:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; layout="absolute">
 <mx:Script>
  <![CDATA[
   [Bindable]
   private var a:Boolean = false;                       
  ]]>
 </mx:Script>
 <mx:MenuBar x="10" y="10" labelField="@label">
  <mx:XMLList id="myXml">
   <menuitem label="Menu">                              
    <menuitem data="test" label="Test" type="check" enabled="{a}"/>             
                
   </menuitem>
  </mx:XMLList>
 </mx:MenuBar>
</mx:Application>


What does it mean ??

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