VSCROLL-POS (numeric)

This special property controls the current scrolling position of the vertical scroll bar, specifying the first visible row of the grid's scrollable region. Note that scrolling is limited to the normal scrolling range. If you specify a value larger than the highest allowed value, the latter value is used. If you specify a value less than 1, you will receive undefined results. If the grid does not allow scrolling in the specified dimension, setting this property has no effect.