Sort the items alphabetically to counter measure reordering of
QMainWindow child dockwidgets.

Change-Id: Ia79ffcb2dcd0c313184bc7bcafb7a4482db72a21
Reviewed-on: http://codereview.qt.nokia.com/1557


Reviewed-by: Bill King <bill.king@nokia.com>
Reviewed-by: hjk <qthjk@ovi.com>