property Group.Index as Long
Indicates the index of the Group object in the Groups collection.

TypeDescription
Long A Long expression that specifies the index of the Group object in the Groups collection. 
The Index property indicates the index of the Group object in the Groups collection. You can use the ItemByIndex property of the Groups collection to access a group giving its index. The Index and ID properties are different. The Index property goes from 0 to Count - 1, while ID property is chosen by the user. The Index property is a read only property.