<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/02/04/detecting-when-the-main-button-on-the-flex-popupbutton-control-has-been-clicked/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
		layout="vertical"
		verticalAlign="top"
		backgroundColor="white" viewSourceURL="srcview/index.html">

	<mx:Style>
		PopUpButton {
			pop-up-style-name: myCustomPopUpStyleName;
		}

		.myCustomPopUpStyleName {
			fontWeight: normal;
			textAlign: left;
		}
	</mx:Style>

	<mx:Script>
		<![CDATA[
			import mx.controls.Alert;
			import mx.controls.Menu;

			[Bindable]
			private var menu:Menu;

			private function popUpButton_initialize():void {
				menu = new Menu();
				menu.dataProvider = arr;
			}

			private function popUpButton_click():void {
				Alert.show("You clicked me, now what?");
			}
		]]>
	</mx:Script>

    <mx:Array id="arr">
        <mx:Object label="Alert" />
        <mx:Object label="Button" />
        <mx:Object label="ButtonBar" />
        <mx:Object label="CheckBox" />
        <mx:Object label="ColorPicker" />
        <mx:Object label="ComboBox" />
    </mx:Array>

	<mx:PopUpButton id="popUpButton"
			label="Please select an item"
			popUp="{menu}"
			initialize="popUpButton_initialize();"
			click="popUpButton_click();" />

</mx:Application>