// Scrolls the list control. If in icon, small icon or report view mode,
// x specifies the number of pixels to scroll. If in list view mode, x
// specifies the number of columns to scroll.
// If in icon, small icon or list view mode, y specifies the number of pixels
// to scroll. If in report view mode, y specifies the number of lines to scroll.
// Scrolls the list control. If in icon, small icon or report view mode,
// x specifies the number of pixels to scroll. If in list view mode, x
// specifies the number of columns to scroll.
// If in icon, small icon or list view mode, y specifies the number of pixels
// to scroll. If in report view mode, y specifies the number of lines to scroll.