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Creating and removing children of an Accordion container

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">     <mx:Script>                  import mx.containers.HBox;         private var hBoxes:Array = [];         public function addControlButton():void {             var newHB:HBox = new HBox();             newHB.label = "my label: " + String(hBoxes.length);             hBoxes.push(myAcc.addChild(newHB));         }         public function deleteControlButton():void {             if (hBoxes.length>= 1) {                 myAcc.removeChild(hBoxes.pop());             }         }            </mx:Script>     <mx:VBox>         <mx:Accordion id="myAcc" height="150" width="150">             <mx:HBox label="Initial HBox" />         </mx:Accordion>         <mx:Button label="Add HBox" click="addControlButton();" />         <mx:Button label="Remove HBox" click="deleteControlButton();" />     </mx:VBox> </mx:Application>