We are building an application using the ribbon and noticed an issue with the focus. If the backstage is open and another application is oppened in front, the focus is lost when we try to bring our application back up (ALT + Tab). We are not able to use the KeyTipAccessText keys at this point and the keyboard does not respond. I noticed the same thing happens in your Sample Browser Application.
Is there any way to fix this? Or do we have to programatically set the focus?