property Items.ItemDividerLine(Item as HITEM) as DividerLineEnum
Defines the type of line in the divider item.

Item as HITEM A long expression that indicates the item's handle.
DividerLineEnum A DividerLineEnum expression that indicates the type of the line in the divider item.
By default, the ItemDividerLine property is SingleLine. The ItemDividerLine property specifies the type of line that underlines a divider item. Use the ItemDivider property to define a divider item. Use the ItemDividerLine and ItemDividerAlignment properties to define the style of the line into the divider item. Use the CellMerge property to merge two or more cells.