[flexcoders] MenuEvent causes 1046 error

[williamchadwick]

I have a menu bar component

     <mx:MenuBar id="mainMenu" labelField="@label"    
                 click="{MenuEvent(event)}"
                 itemClick="{MenuItemEvent(event)}">

Everytime I create a handler like this:

     private function MenuItemEvent(e:MenuEvent):void

I get a "Type was not found or was not a compile-time constant: MenuEvent"

But, I've explicitly imported this event:

     import mx.events.MenuEvent;

Am I going mad? What am I doing wrong? I'm using standalone Flex Builder 
3.0.2.214193 on Windows XP- not the Eclipse plug-in.

Please help,

William Chadwick