Test Runner Pause and resume . "Save and Close" vs "Return to Test Center"

In this book (TFS 2010) it states that "Return to the Testing Center" pauses the test execution with "in progress" status. And that we can resume later

When I tried it in TFS MTM 2013. Just the opposite is happening. "Save and Close" actually does this. So what is the use of "Return to the Testing Center" ?