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private function init():void { var sp:Sprite = new Sprite(); addChild(sp);}
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→DisplayObjectContainer
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public override function addChild(child:DisplayObject):DisplayObject
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* <p><b>Note: </b>While the <code>child</code> argument to the method
* is specified as of type DisplayObject, the argument must implement
* the IUIComponent interface to be added as a child of a container.
* All Flex components implement this interface.</p>
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import mx.core.UIComponent;private function init():void {
var sp:Sprite = new Sprite();
var uc:UIComponent = new UIComponent();
uc.addChild(sp); addChild(uc);
}
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teacher.call("name1" );
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public function receive(e:CallEvent):void
{
    if (e.name == this.name)
    {
     trace(name + " is here");
     this.dispatchEvent(e);
    }
}
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<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
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<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
creationComplete="init()"
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<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" width="400" height="300">
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