PopUpButton  - AS3 Flex

<?xml version="1.0" encoding="utf-8"?>
<!-- Simple example to demonstrate the Halo PopUpButton 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.*;
            import mx.events.*;

            private var myMenu:Menu;

            // Initialize the Halo Menu control, and specify it as the pop up object
            // of the Halo PopUpButton control.
            private function initMenu():void {
                myMenu = new Menu();
                var dp:Object = [{label: "New Folder"}, {label: "Sent Items"}, {label: "Inbox"}];
                myMenu.dataProvider = dp;
                myMenu.selectedIndex = 0;       
                myMenu.addEventListener(MenuEvent.ITEM_CLICK, itemClickHandler);
                popB.popUp = myMenu;
                popB.label = "Put in: " + myMenu.dataProvider[myMenu.selectedIndex].label;
            }

            // Define the event listener for the Halo Menu control's itemClick event. 
            private function itemClickHandler(evt:MenuEvent):void {
                var label:String = evt.item.label;
                popTypeB.text = String("Moved to " + label);
                popB.label = "Put in: " + label;
                popB.close();
                myMenu.selectedIndex = evt.index;
            }

        ]]>
    </fx:Script>

    <s:Panel title="PopUpButton Control Example"
            width="75%" height="75%"
            horizontalCenter="0" verticalCenter="0">
        <s:VGroup left="10" right="10" top="10" bottom="10">
            <s:Label width="100%" color="blue"
                    text="Button label contains the name of the last selected menu item." />
            <mx:PopUpButton id="popB" label="Edit" creationComplete="initMenu();" width="135" />

            <mx:Spacer height="50" />

            <s:TextInput id="popTypeB" />
        </s:VGroup>
    </s:Panel>

</s:Application>