Manually dispatching event in as3

hi:

how can I simulate events for a demo like in this example:

import flash.events.*;

function traceTxT(e:MouseEvent):void {

  trace("button clicked");

}

blueBtn.addEventListener(MouseEvent.CLICK, traceTxT);

if I add:

blueBtn.dispatchEvent(new Event(MouseEvent.CLICK));

I receive this error:

TypeError: Error #1034: Type Coercion failed: cannot convert flash.events::Event@1d7eed81 to flash.events.MouseEvent.

at flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchEventFunction()

at flash.events::EventDispatcher/dispatchEvent()

at dispatcher_fla::MainTimeline/dispatcher_fla::frame1()

thanks in advance