<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/11/01/creating-unique-identifiers-for-objects-using-the-getuid-method/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
            import mx.controls.Alert;
            import mx.utils.ObjectUtil;
            import mx.utils.UIDUtil;

            private function displayUID():void {
                var text:String = ObjectUtil.toString(myObj);
                var title:String = UIDUtil.getUID(myObj);
                Alert.show(text, title);
            }
        ]]>
    </mx:Script>

    <mx:Object id="myObj" name="peter" site="flexexamples.com" />

    <mx:ApplicationControlBar dock="true">
        <mx:Button label="Display UID"
                click="displayUID();" />
    </mx:ApplicationControlBar>

</mx:Application>