You can access vars from other documents in Nspire BASIC, but I don't think you can change anything UI-related like what file is open directly. You can alter variables that are graphed, for example, and they will update if you look at the graph screen, but you can't tell the calc to go to said graph screen with a function.
If you have a split view where you can see both the graph and the input, and you update a list that is being graphed, then that list will update without any further input, but the calculator portion will still be visible. I know it's not exactly what you had in mind, but at least you don't have to manually switch between views.
