public static Result DisplayConduit(RhinoDoc doc)
 {
     // The following code lets you toggle the conduit on and off by repeatedly running the command
     if (m_conduit != null)
     {
       m_conduit.Enabled = false;
       m_conduit = null;
     }
     else
     {
       m_conduit = new MyConduit { Enabled = true };
     }
     doc.Views.Redraw();
     return Result.Success;
 }