YouTube iframe for Windows 8

So, I use YouTube iframes to show some videos in my application. The fact is that I can’t make a video in full screen.

I am using this code:

<iframe width="560" height="315" src="http://www.youtube.com/embed/RnYcPJTtV1A" frameborder="0" allowfullscreen></iframe>

If you write that in one html file the browser (all of them) will show you the button fullscreenon the right. But the same code in the Win8 application (html, of course) will display the video, but will not display the full-screen button.

Do you want what YouTube wants (google)? I mean, should I do something else?

Hi