Use PopUpMenuButton change event to set the label

     
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" height="600"
    width="600">
    <mx:Script>
        
        import mx.events.MenuEvent;
        public function itemClickHandler(event:MenuEvent):void {
            event.currentTarget.label= "Send to: " + event.label;
        }
        [Bindable]
        public var menuData:Array = [
            {label: "A", data: "a"},
            {label: "B", data: "b"},
            {label: "C", data: "c"},
            {label: "D", data: "d"},
            {label: "E", data: "e"}
        ];
      
    </mx:Script>
    <mx:PopUpMenuButton id="p1" 
                        showRoot="true" 
                        dataProvider="{menuData}" 
                        label="Send to: Inbox"
                        itemClick="itemClickHandler(event);" />
</mx: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 XMLListCollection as the PopUpMenuButton data source
10.	Item click event for PopUpMenuButton
11.	PopUpMenuButton and XMLList data provider
12.	how the PopUpMenuButton generates events and how an application can handle them
13.	Creating a PopUpMenuButton control
14.	To use a dynamic label property, use a PopUpMenuButton control change event listener

Use PopUpMenuButton change event to set the label : PopUpMenuButton « Components « Flex

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