Flex4中添加自定义右键菜单

下面这个例子给Flex的右键添加一个自定义的菜单，并且在点击菜单内容时，执行事件

var copyrightMenuItem:ContextMenuItem = new ContextMenuItem("菜单内容", true, true);
copyrightMenuItem.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT,function(e:ContextMenuEvent){ 
    Alert.show((e.currentTarget as ContextMenuItem).caption); 
}); 
var contextMenuCustomItems:Array = FlexGlobals.topLevelApplication.contextMenu.customItems; 
contextMenuCustomItems.push(copyrightMenuItem); 

我使用的是Flex4，如果是Flex3，需要把

var contextMenuCustomItems:Array = FlexGlobals.topLevelApplication.contextMenu.customItems;

替换为

var contextMenuCustomItems:Array = application.contextMenu.customItems;