property Item.UserData as Variant
Associates an extra data to the object.

TypeDescription
Variant A VARIANT expression that indicates the item's extra data.
By default, the UserData is empty. Use the UserData property to associate any extra data to the item. Use the Caption property to specify the item's caption. Use the Tooltip property to specify the item's tooltip which can be shown when the cursor hovers the item. The Item property searches recursively the item with giving identifier/caption.