Scroll Bars
The right side of the grid control contains two vertical scrollbars. The lower scrollbar, which has no thumb, moves the grid display one page up or one page down each time it is left clicked, similar to pressing the keyboard page up / page down keys.
The upper scrollbar, which contains a thumb, moves the display one line up or one line down when left clicking on the arrow portion of the control.
In Attached File mode 1 and 3, moving the thumb of the upper scrollbar will cause a move to a position in the attached file proportionally to the location of the thumb within the scrollbar. As an example, If the thumb is at its' top most position, the grid display contains the record data corresponding to the beginning keys in the file. At thumb mid position, the record data displayed corresponds to the keys in the middle of the file, and so on.
In Attached File mode 2, moving the thumb has the same affect as left clicking on the scrollbar up or down arrow. Prototype Topic: Attached File, provides additional information on this subject.