GENERIC INTERFACEVBTPane (SubPaneVBT);
a VBTPane is a pane which simply displays a PaneVBT. most document panes will be VBTPanes.
IMPORT Pane; CONST Name = SubPaneVBT.Name; Ext = SubPaneVBT.Ext; StartKey = SubPaneVBT.StartKey; TYPE T <: Pane.T; END VBTPane.