Now, try selecting several values at once on the list box… and then click the down arrow. The group of selections all move down one value. Now, try pressing the Page Down key on your keyboard and the group of selections move down several values. If this was a field of dates and you had selected seven dates then pressing Page Down would move down an entire week. The values that you select don’t need to be contiguous values and the technique still works.
Sometimes you might need to lock some of the other selections in order to better control the values that you step through.