Gets the field being processed.
A PivotGridField object, which is the field being processed.
When PivotGridControl is in the Asynchronous Mode, the PivotGridControl.CustomGroupInterval event is handled in a background thread. In this instance, the Field property does not guarantee thread safety when accessing the processed field. If you try to use the Field property in the Asynchronous Mode, an exception will be thrown. Use the PivotCustomGroupIntervalEventArgs.ThreadSafeField property to access the field thread safely.