GUI Icon Save Button Porblem

I created a GUI with GUIDE.

When I run it, there is a top row of icon buttons, which I didn't add explicitly, including a save icon button. I tried clicking on it to see what it does. It seems to save the current GUI in my .fig file, overwritting the original .fig file!! That's very bad! Nothing should overwrite the original .fig file!!

How do I disable this save icon button?

Cheers, Bob Gray