Flash as3 dispatchEvent

I am successfully dispatching a mouse event to a button–however the visual aspect of the event is not being seen–inother words if I dispatch CLICK I get a click but do not see the buton change as if I had clicked the button with the mouse–I am not really accessing the “up” “over” “down” frames of the button
what I want is to mimic MOUSE_OVER with a timed event not a mouse