Determining when the location changes on the HTML control in Adobe AIR

<?xml version="1.0" encoding="utf-8"?>
<!-- http://airexamples.com/2009/01/03/determining-when-the-location-changes-on-the-html-control-in-adobe-air/ -->
<mx:WindowedApplication name="HTML_locationChange_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="absolute"
        backgroundColor="white"
        width="1024"
        height="768">
 
    <mx:Script>
        <![CDATA[
            import mx.controls.Alert;
 
            private function btn_click(evt:Event):void {
                html.location = textInput.text;
            }
 
            private function html_locationChange(evt:Event):void {
                Alert.show("Attempting to load " + html.location);
            }
        ]]>
    </mx:Script>
 
    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain"
                defaultButton="{btn}"
                width="100%">
            <mx:FormItem label="location:"
                    direction="horizontal"
                    width="100%">
                <mx:TextInput id="textInput"
                        text="http://airexamples.com/"
                        width="100%" />
                <mx:Button id="btn"
                        label="Go"
                        click="btn_click(event);" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>
 
    <mx:HTML id="html"
            width="100%"
            height="100%"
            locationChange="html_locationChange(event)" />
 
</mx:WindowedApplication>