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

    
    xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx">
     
         
        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"} 
        ]; 
      
    
            dataProvider="{menuData}" label="Send to: Inbox" itemClick="itemClickHandler(event);" />