Why would you want to move the title bar above the screen top? If you did that you would not have access to the minimize/maximize/close buttons on the title bar ever again. and many windows remember their last position so reopening them would give the same problem even if you killed them to get them off the screen after making the title bar inaccessible.
You could right-click on any exposed part of the window border and select "move" (or hit Alt-F7 anywhere in the window) to bring the title bar back into view.
Paul.
