iTunes 10.7 is not available to use shortcuts for change video size.

Hi, I saw this help and know there are shortcuts for change video window size.

iTunes 10 for Mac: Keyboard shortcuts

http://support.apple.com/kb/PH1008

For example, "Display video half size" is Command-0.

I tried it, but not working...

I think iTunes 10 is too old. But this document was updated 21 September, 2012. It's new.

Then, On System Preferences, open Keyboard Shortcus, I set custom shortcuts manually for iTunes.app.

But, still not working...Why?

I use video playback "in seperate window".

What's wrong is it?

Thanks.