<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/17/disabling-an-alert-control-in-flex/?preview=true -->
<mx:Application name="Alert_enabled_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white" viewSourceURL="srcview/index.html">
    
    <mx:Script>
        <![CDATA[
            import mx.controls.Alert;
            import mx.managers.PopUpManager;

            private const ENABLE_DELAY:uint = 3000; // 3 seconds

            private var a:Alert;

            private function showAlert():void {
                a = Alert.show("You have been logged out.", "Goodbye");
                a.enabled = false;
                setTimeout(enableAlert, ENABLE_DELAY, a);
            }

            private function enableAlert(target:Alert):void {
                target.enabled = true;
                // PopUpManager.removePopUp(target);
            }
        ]]>
    </mx:Script>

    <mx:Button id="button"
            label="Logout"
            click="showAlert();" />

</mx:Application>