Renders border around the listview items. Valid values are:

• all: renders borders around listview items.
• horizontal: renders top border of listview items. Useful when setting layout: "flex" and flex.direction: column.
• vertical: renders top border of listview items. Useful when setting layout: "flex" and flex.direction: row.

Note: in order for the property to work, set k-listview-item class name to listview items in your template.