Gets or sets a value indicating whether the outline is expanded for the pivot item.
true, to show details for the current item; otherwise, false.
For example, the following code snippet demonstrates how to hide details for the first item ("Dairy Products") in the "Category" field.
The image below shows the result of the code's execution.
Note that you can also hide the expand/collapse buttons in the report by using the PivotViewOptions.ShowDrillIndicators property.