property Editor.ItemToolTip(Value as Variant) as String
Gets or sets the text displayed when the mouse pointer hovers over a predefined item.

TypeDescription
Value as Variant A long expression that indicates the value of the item whose tooltip is accessed, a string expression that indicates the caption of the item whose tooltip is accessed. 
String A string expression that may include HTML tags, that indicates the text being displayed when the mouse hovers the item.
Use the ItemToolTip property to assign a tooltip for a drop down list value. Use the AddItem or InsertItem methods to insert new items to the drop down predefined list. The ItemToolTip property may include built-in HTML format.