Represents a Chart's Z axis. This object's properties directly affect the display of the Z axis and the Z Categories in the Outliner.
This example shows how to sort the “Quarter” X categories by label:
ActiveDocument.Sections["BooksChart"].XCategories["Quarter"].SortByLabel()
Hide(), SortByFact(String FactName, BqSortFunction SortFunction, [optional] BqSortOrder SortOrder), SortByLabel{[optional] BqSortOrder SortOrder}
Read-only: Property Name as String, SortFactName as String, SortFunction as Number, SortOrder as Number