To use a dynamic label property, use a PopUpMenuButton control change event listener

     
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    <!-- menus/PopUpMenuButtonLabel.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">
    <fx:Script> 
         
        import mx.events.MenuEvent; 
        public function itemClickHandler(event:MenuEvent):void { 
            event.currentTarget.label= "Send to: " + event.label; 
        } 
        [Bindable] 
        public var menuData:Array = [ 
            {label: "Inbox", data: "inbox"}, 
            {label: "Calendar", data: "calendar"}, 
            {label: "Sent", data: "sent"}, 
            {label: "Deleted Items", data: "deleted"}, 
            {label: "Spam", data: "spam"} 
        ]; 
      
    </fx:Script>
    <mx:PopUpMenuButton id="p1" showRoot="true"
        dataProvider="{menuData}" label="Send to: Inbox" itemClick="itemClickHandler(event);" />
</s:Application>

1.	Setup data provider for PopUpMenuButton
2.	PopUpMenuButton click event
3.	Hard code data provider for PopUpMenuButton
4.	Menu Separator for PopupMenuButton
5.	Setup PopupMenuButton
6.	Create PopUpMenuButton from Array
7.	Click event for PopUpMenuButton
8.	Create a PopUpMenuButton control using an E4X XML data provider.
9.	Use PopUpMenuButton change event to set the label
10.	Use XMLListCollection as the PopUpMenuButton data source
11.	Item click event for PopUpMenuButton
12.	PopUpMenuButton and XMLList data provider
13.	how the PopUpMenuButton generates events and how an application can handle them
14.	Creating a PopUpMenuButton control

To use a dynamic label property, use a PopUpMenuButton control change event listener : PopUpMenuButton « Components « Flex

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