In the simulator (4.1.1) according to the File menu I should be able t take a screenshot with the shortcut Ctrl+S, however it gives the following error message:
No values defined
This app does not have any saved any objects
from Application.Storage.setValue()
Clicking on File > Save Screen Capture using the mouse works.
Note also the typo in the error message: "This app does not have any saved any objects" (the word "any" is twice there)