<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/03/20/creating-custom-pop-up-windows-with-the-popupmanager-class-redux/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white" viewSourceURL="srcview/index.html">

    <mx:Script>
        <![CDATA[
            import mx.managers.PopUpManager;

            private function launchMoreInfo():void {
                var win:Dialog = PopUpManager.createPopUp(this, Dialog, true) as Dialog;
                PopUpManager.centerPopUp(win);
            }
        ]]>
    </mx:Script>

    <mx:ApplicationControlBar dock="true">
        <mx:Button id="button"
                label="Click for more information"
                click="launchMoreInfo();" />
    </mx:ApplicationControlBar>

</mx:Application>