Removes the referenced diagram type from the Diagram New and Diagram Open dialogs.

Instead of using this keyword, a less drastic change is to deselect the diagram type from the Property Configuration dialog (select Tools, Customize Method Support, Encyclopedia Configuration, and either toggle off the method employing the diagram type or click the Advanced button on the Property Configuration dialog and move the diagram type from the "Selected Diagrams" to the "Available Diagrams" list).