Occurs after the field's summary type has been changed.
public event EventHandler SummaryTypeChanged
Public Event SummaryTypeChanged As EventHandler
The SummaryTypeChanged event's data class is EventArgs.
If the PivotGridFieldOptions.AllowRunTimeSummaryChange option is enabled, an end-user can change the data field's summary type by clicking its header (see the image below):
To change the field's summary type in code, use the PivotGridFieldBase.SummaryType property.
In both cases, changing the field's summary type raises the SummaryTypeChanged event.