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    xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx">
     
         
        import flash.events.*; 
        import mx.events.*; 
        import mx.controls.*; 
        private function initTree():void { 
            XMLTree1.expandItem(MailBox.getItemAt(0), true); 
            XMLTree1.selectedIndex = 2; 
        } 
      
    
            creationComplete="initTree();">