I just bought a new d90 last weekend, and in flexible program mode you can select different combinations of shutter speed/aperture. The manual says to rotate the main command dial until the flexible program icon appears in the control panel,then turn the dial to the right for large aperture/fast shutter speeds or to the left for small aperture/slow shutter speeds. I can get the icon to appear, but cant select different combos. I turned the command dial in each direction but it doesent move from the cameras setting. Am I missing something or doing something wrong? Any help would be much appreciated!