System.Design 2.0.0.0 To be added. Provides an interface for accessing a document item retrieved from a design host at design time. Method 2.0.0.0 System.IO.Stream To be added. Provides access to the contents of a document item that is retrieved from the design host. A object. Method 2.0.0.0 System.Void To be added. Opens a document item that is retrieved from the design host.