Occurs before a new object is created in a List Editor.
The NewObjectAdding event's data class is DevExpress.ExpressApp.Editors.NewObjectAddingEventArgs.
This event occurs only in those List Editors whose controls support creation of new objects and supply the required event notification. For instance, the built-in GridListEditor supports this event because its XtraGrid control can display the new item row.
When deriving from the ListEditor class, raise this event before creating a new object in a List Editor’s control. In addition, the ListEditor.NewObjectCreated and ListEditor.NewObjectCanceled events should be raised where appropriate. In this instance, the NewObjectViewController will correctly create and manage a business object of the required type.