Close the given window (property _NET_CLOSE_WINDOW)

        :param win: the window object

def setCloseWindow(self, win):
        """
        Close the given window (property _NET_CLOSE_WINDOW)

        :param win: the window object"""
        self._setProperty('_NET_CLOSE_WINDOW',
                          [int(time.mktime(time.localtime())), 1], win)