Use graphics from Sprite to draw circle
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
import flash.display.Sprite;
import mx.core.UIComponent;
private function addChildToPanel():void {
var circle:Sprite = new Sprite();
circle.graphics.beginFill(0xFFFF00);
circle.graphics.drawCircle(0, 20, 20);
var c:UIComponent = new UIComponent();
c.addChild(circle);
panel1.addChild(c);
}
</mx:Script>
<mx:Panel id="panel1" height="100" width="100" />
<mx:Button id="myButton" label="Click Me" click="addChildToPanel();" />
</mx:Application>
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