[Flex] PopUpButton系列 —— 添加按钮图标

<?xml version="1.0" encoding="utf-8"?>
<!--为主按钮添加默认图标 PopUpButtonIcon.mxml-->
<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" minWidth="955" minHeight="600">
    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
        <fx:Array id="arr">
            <fx:Object label="《霹雳先锋》香港票房8916612" />
            <fx:Object label="《捕风汉子》香港票房3149395" />
            <fx:Object label="《小偷阿星》香港票房7968106 " />
            <fx:Object label="笑傲江湖之东方不败（1992）" />
            <fx:Object label="精武英雄（1994）" />
            <fx:Object label="给爸爸的信（1995）" />
        </fx:Array>
    </fx:Declarations>
    <fx:Style>
        @namespace s "library://ns.adobe.com/flex/spark";
        @namespace mx "library://ns.adobe.com/flex/mx";
        mx|PopUpButton {
            popUpStyleName: myCustomPopUpStyleName;
        }
        
        .myCustomPopUpStyleName {
            fontWeight: normal;
            textAlign: left;
        }

    </fx:Style>
    <fx:Script>
        <![CDATA[
            import mx.controls.Menu;
            import mx.events.FlexEvent;
            [Bindable]
            [Embed(source="assets/icon.png")]
            private var iconClass:Class;
            [Bindable]
            private var menu:Menu;
            
            protected function popUpButton_initializeHandler(event:FlexEvent):void
            {
                menu = new Menu();
                menu.dataProvider = arr;
            }
            
        ]]>
    </fx:Script>
    <mx:PopUpButton id="popUpButton" label="Please select an item..." icon="{iconClass}" popUp="{menu}" initialize="popUpButton_initializeHandler(event)"/>
</s:Application>