Disable workspace switch when opening a new window of a program already opened in another workspace When I want to open a new window of a program already opened in another workspace the opened window gets automatically focused in the other workspace. Thats annoying because I always have to get back to the previous workspace and use the context menu in Dock to force a new window. How is it possible to turn that off? I am using OS X Mountain Lion.
You can do this by turning off the "When switching to an application, switch to a space with open windows for the application" checkbox in Mission Control preferences.

However, this will mean that when you toggle to a different application, with Cmd+Tab or another mechanism, you'll stay in the same workspace. This may or many not be convenient for your workflow.