public override void CancelNew ()
{
if (IsEditingItem)
throw new InvalidOperationException ("Cannot CancelNew while editing an item");
if (IsAddingNew) {
if (CurrentAddItem is IEditableObject)
((IEditableObject) CurrentAddItem).CancelEdit ();
if (Grouping) {
RootGroup.RemoveItem (CurrentAddItem);
}
RemoveFromSourceCollection (SourceCollection.IndexOf (CurrentAddItem));
CurrentAddItem = null;
IsAddingNew = false;
UpdateCanAddNewAndRemove ();
}
}