Esc key - Keyboard event in Actionscript 3

I am trying to associate an action to Escape-key event in AS3 using the following code.
The problem is that the event is triggered (rather 'pressed escape' is printed) only when I press Shift+Escape and not just Escape.
I want it to work with just Escape key.

I would greatly appreciate if anyone can point me to the mistake I am making. Thanks.

stage.addEventListener(KeyboardEvent.KEY_DOWN, KeyPressed);
function KeyPressed(evnt:KeyboardEvent){
	switch (evnt.keyCode) {
	case Keyboard.ESCAPE :
	trace("pressed escape")
	break;
	case Keyboard.RIGHT :
	trace("RIGHT");
	break;
	case Keyboard.LEFT :
	trace("LEFT");
	break;
	}
}

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