The manual says to open up the menu you use The Shift + 3 Key. I tried that and it doesn't work. How do I get around that one ? Thanks

Do you mean the Aerosoft Catalina or the Katana? If you are referring to the latter (which I think), what's the version you are running? There's an older one (just "DA20" I think) and the latest thing which is called "4X" (for experts).

 

Mind you, you can always select available popup views via FSX' views menu in the menu bar. If it's just your keyboard command stopping you so far, make sure that the commands are defined in the keyboard configuration.

 

Those commands should read like "panel 1" being defined as "shift+1" and so on up to 9. Must be somewhere in the views section of the keyboard/button configuration.