Hi, Looks there there's a couple of issues that need to be sorted - try this out:
<?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" applicationDPI="640"> <s:layout> <s:VerticalLayout /> </s:layout> <fx:Script> <![CDATA[ import mx.events.FlexEvent; import mx.managers.PopUpManager; import spark.components.TitleWindow; import spark.events.PopUpEvent; protected function popup(event:MouseEvent):void { PopUpManager.addPopUp(new TitleWindow(), this); } ]]> </fx:Script> <s:Label text="Hello" /> <s:Button label="show popup" click="popup(event)" /> <s:RadioButton label="On" /> <s:RadioButton label="Off" /> <s:CheckBox label="one" /> <s:CheckBox label="two" /> <s:CheckBox label="three" /> </s:Application> Thanks, Justin