public static Result PrePostPick(RhinoDoc doc)
    {
        var go = new Rhino.Input.Custom.GetObject();
        go.SetCommandPrompt("Select objects");
        go.EnablePreSelect(true, true);
        go.EnablePostSelect(true);
        go.GetMultiple(0, 0);
        if (go.CommandResult() != Result.Success)
          return go.CommandResult();

        var selected_objects = go.Objects().ToList();

        if (go.ObjectsWerePreselected)
        {
          go.EnablePreSelect(false, true);
          go.DeselectAllBeforePostSelect = false;
          go.EnableUnselectObjectsOnExit(false);
          go.GetMultiple(0, 0);
          if (go.CommandResult() == Result.Success)
          {
        foreach (var obj in go.Objects())
        {
          selected_objects.Add(obj);
          // The normal behavior of commands is that when they finish,
          // objects that were pre-selected remain selected and objects
          // that were post-selected will not be selected. Because we
          // potentially could have both, we'll try to do something
          // consistent and make sure post-selected objects also stay selected
          obj.Object().Select(true);
        }
          }
        }
        return selected_objects.Count > 0 ? Result.Success : Result.Nothing;
    }