The PivotGridControl.FieldPropertyChanged event occurs after a field's property has been changed. Use the DevExpress.XtraPivotGrid.PivotFieldEventArgsBase`1.Field and PropertyName properties to obtain the processed field and the actual property changed, respectively.
System.Object
System.EventArgs
PivotFieldEventArgsBase<PivotGridField>
PivotFieldEventArgs
PivotFieldPropertyChangedEventArgs