A node which just acts as a mirror of another node, usually partially overriding the original's behavior. The template shows how to control which operations and delegated to the original node, and which are performed on the filter node. It also includes examples of adding cookies and properties (on the Property Sheet) to the original (the additions being visible only in the filter).

The template also includes a FilterNode.Children implementation which permits you to also customize the appearance and behavior of the displayed children of the filter node, such as specially mirroring the original node's children. There are no icons in this template because usually the icon is delegated to the original node.