ZFP - Able to use mouse wheel to scroll images with sheet view layout

When users view images in ZFP with sheet view layout, it is not allowed to use mouse wheel to scroll to view. They can only click the buttons from toolbar to page up and page down, and it waste a lot of time to do so.

No matter in Cweb, UV, or RA1000, users can always use scrolling wheel to view images in sheet view layout.