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Obsolete TreeViewItem is now deprecated. You can likely now use TreeViewItem<int> instead and not think more about it. But if you were using that identifier to store InstanceID data, you should instead opt to upgrade your TreeViews to use TreeViewItem<InstanceID> to get the proper typing.
Declaration
public void AddChild(TreeViewItem child);
Parameters
Parameter
Description
child
TreeViewItem to be added to the children list.
Description
Helper method that adds the child TreeViewItem to the children list and sets the parent property on the child.