Represents a collection of PivotItem objects in a PivotTable field.
When you create a pivot table, the PivotItemCollection collection is populated automatically with the unique data entries retrieved for each field from the source data. To return a collection of items contained in a specific PivotTable field, use the PivotField.Items property. An individual PivotItem object can be accessed by its index in the collection.
If you add a calculated item to the PivotField.CalculatedItems collection of a PivotTable field, it's also automatically added to the field's PivotItemCollection collection.
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