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();
}
}