Use the Clear method to clear the Items collection. Use the RemoveItem method to remove a specific item. Use the the Visible property to hide an item. The control fires the RemoveItem event when an item is removed. Use the Count property to count the items in the group. Use the Item property to access an item giving its index or by its caption. Use the ItemByPos property to get the item giving its position. Use the ItemHeight property to specify the height for all items in the group.