Exiting Full Screen Mode with ESC key...

Hello,
I'm working on video player and have a problem when exiting esc key.
I hide unnecessary object such as player's skin and logo when entered full screen mode by using DisplayObject's visible property and displayState property of stage as shown below.

I have no problem as long as user pressed on "Full Screen" button on this player.
But I cannot detect when user exiting full screen mode by pressing esc key.

So, I defined escFullScreen funciton and trying to listen for KeyboardEvent.
However, it looks like it doesn't listen KeyboardEvent when the player is Full Screen Mode.

How do I  make this work?
Please advise.

Thank you.

import flash.display.*;
import flash.events.*;
import flash.ui.Keyboard;
 
.....................
fullscreen_btn.addEventListener(MouseEvent.CLICK, fullScreen);
stage.addEventListener(KeyboardEvent.KEY_DOWN, escFullScreen);
 
public function fullScreen(event:MouseEvent):void
{
	if (stage.displayState == StageDisplayState.NORMAL) {
		logo_mc.visible = false;
		skin_bg.visible = false;
		stage.displayState=StageDisplayState.FULL_SCREEN;
	} else {
		logo_mc.visible = true;
		skin_bg.visible = true;
		stage.displayState=StageDisplayState.NORMAL;
	}
}
 
public function escFullScreen(event:KeyboardEvent):void
{
	if (stage.displayState == StageDisplayState.FULL_SCREEN && event.keyCode == Keyboard.ESCAPE)
	{
		logo_mc.visible = true;
		skin_bg.visible = true;
	}
}

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