标题固定和嵌入图标tileIcon的Alert如何写

 package cn.ipanel { import flash.display.Sprite; import mx.controls.Alert; public class CustomAlert { public function CustomAlert() { } [Embed(source="assets/iconCritical.png")] private var IconCritical:Class; public static function show(text:String="", title:String="", flags:uint=0x4, parent:Sprite=null, closeHandler:Function=null, iconClass:Class=null, defaultButtonFlag:uint=0x4):Alert { var alert:Alert; alert=Alert.show(text, "靠", flags, parent, closeHandler, iconClass, defaultButtonFlag); alert.titleIcon = BulletCritical; return alert; } } }