frameworks/projects/framework/asdoc/en_US/mx/controls/examples/SimpleAlert.mxml

<?xml version="1.0" encoding="utf-8"?>
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<!-- Simple example to demonstrate the Halo Alert control. -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/mx">

    <fx:Script>
        <![CDATA[
            import mx.controls.Alert;
            import mx.events.CloseEvent;

            // Event handler function uses a static method to show
            // a pop-up window with the title, message, and requested buttons.
            private function clickHandler(evt:Event):void {
                Alert.show("Do you want to save your changes?", "Save Changes", Alert.YES|Alert.NO, this, alertClickHandler);
            }

            // Event handler function for displaying the selected Alert button.
            private function alertClickHandler(evt:CloseEvent):void {
                if (evt.detail == Alert.YES) {
                    status.text = "You answered Yes";
                } else {
                    status.text = "You answered No";
                }
            }

            // Event handler function changes the default Button labels and sets the
            // Button widths. If you later use an Alert with the default Buttons, 
            // you must reset these values.
            private function secondClickHandler(evt:Event):void {
                Alert.buttonWidth = 100;
                Alert.yesLabel = "Magenta";
                Alert.noLabel = "Blue";
                Alert.cancelLabel = "Green";

                Alert.show("Select a color:", "Color Selection", Alert.YES|Alert.NO|Alert.CANCEL, this);

                // Set the labels back to normal:
                Alert.yesLabel = "Yes";
                Alert.noLabel = "No";
            }
        ]]>
    </fx:Script>

    <s:Panel title="Halo Alert Control Example"
            width="75%"
            horizontalCenter="0" verticalCenter="0">
        <s:VGroup left="10" right="10" top="10" bottom="10">
            <s:Label color="blue"
                    text="Click the button below to display a simple Alert window."/>
            <s:Button label="Click Me" click="Alert.show('Hello World!', 'Message');"/>

            <mx:HRule width="100%" />

            <s:Label color="blue" 
                    text="Click the button below to display an Alert window and capture the button pressed by the user."/>
            <s:Button label="Click Me" click="clickHandler(event);"/>
            <s:Label id="status" fontWeight="bold"/>

            <mx:HRule width="100%" />

            <s:Label color="blue"
                    text="Click the button below to display an Alert window that uses custom Button labels."/>
            <s:Button label="Click Me" click="secondClickHandler(event);"/>
        </s:VGroup>
    </s:Panel>

</s:Application>