Page.Index Property (Visio)
Gets or sets the ordinal position of a page in a Pages collection. Read/write.
In versions earlier than 2002, the Index property of the Page object was read-only.
The Pages collection is indexed starting with 1 rather than zero (0), so the index of the first element is 1, the index of the second element is 2, and so on. The index of the last element in a collection is the same as the value of that collection's Count property. You can iterate through a collection by using these index values. Adding objects to or deleting objects from a collection can change the index values of other objects in the collection.
You may only assign a new index to a foreground page. Background pages are unordered. Use the Background property to determine if a given page is a background page.
Use the BackPage property to assign a background page to a foreground page or to another background page.