[flexcoders] TabNavigator and index out of bounds exception

[Mark Bradley]

Greetings,

I am trying to figure out how to get the TabNavigator to create it's  
children so they are accessible after I add the TabNavigator to it's  
parent through addChild().  However, I am getting an index out of  
bounds error because the TabBar children have not been created yet.   
Does anyone know how I can force creation of the TabBar children so I  
can assess them immediately?

Below is an example of the code that show my problem.

Thanks,

-Mark

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml";  
verticalGap="0" xmlns:local="*" height="100%" initialize="addTabs()" >
<mx:Script>
<![CDATA[
        import mx.containers.Box;
        import mx.containers.TabNavigator;

 private function addTabs(): void {
         var tn:TabNavigator = new TabNavigator();
         var box:Box = new Box();
         box.label = "1";
         tn.addChild( box );

         box = new Box();
         box.label = "2";
         tn.addChild( box );

         box = new Box();
         box.label = "3" ;
         tn.addChild( box );
        
         box = new Box();
         box.label = "4";
         tn.addChild( box );
        
         addChild( tn );
         trace( tn.getTabAt( 3 ) );
 }

]]>
 </mx:Script>
</mx:Application>