I have just purchased a new apple thunderbolt display so I can do the whole dual monitor set up thing with my macbook air. I've got it set up in the extended desktop mode at the moment, with photoshop running on the new display. I have 2 desktops on my macbook air screen that I flick between (chrome on the first and itunes on the second). When I flick between chrome and itunes with the thunderbolt display connected it flicks between the extended desktops also, making photoshop go off the screen. Does anyone know how can I make it so that the external display shows a static desktop so that photoshop stays still whilst i flick between desktops on my air?