Provides data for the ImmutabilityProvider.cloningItem event.
Initializes a new instance of the CloningItemEventArgs class.
The original item which is about to be cloned by the grid.
This property should be assigned by an event handler with an object representing
a clone of the originalItem.
If not assigned then ImmutabilityProvider will clone item using its
Provides a value to use with events that do not have event data.