Rhino.Input.Custom.GetObject custom filters with grips

Hi all!
I’m trying to select grips of a specific SubD, one by one (to retain order).
Not grips of other objects.
Not more than one at once at time.

Problems:

Code for the top one:

  void SelectMultipleGrips(GH_Document doc){
    Rhino.Input.Custom.GetObject go = new Rhino.Input.Custom.GetObject();
    go.GeometryFilter = Rhino.DocObjects.ObjectType.Grip;
    go.SetCustomGeometryFilter(IsGripOwnedByGuid);
    go.SetCommandPrompt("Select grips");

    go.SubObjectSelect = false; //If you remove this row, IsGripOwnedByGuid filter won't work.
    go.OneByOnePostSelect = true;
    go.ChooseOneQuestion = true;

    go.GetMultiple(1, 0);

    objs = go.Objects();
    this.Component.ExpireSolution(true);
  }

  static System.Guid SubDId = new System.Guid();
  static bool IsGripOwnedByGuid(Rhino.DocObjects.RhinoObject obj, GeometryBase geo, ComponentIndex index){
    return ((Rhino.DocObjects.GripObject) obj).OwnerId.Equals(SubDId);
  }

Code for the bottom one:

  void SelectMultipleGrips(GH_Document doc){
    Rhino.Input.Custom.GetObject go = new Rhino.Input.Custom.GetObject();
    go.SetCustomGeometryFilter(NOTHING);

    go.GetMultiple(1, 0);

    objs = go.Objects();
    this.Component.ExpireSolution(true);
  }


  static bool NOTHING(Rhino.DocObjects.RhinoObject obj, GeometryBase geo, ComponentIndex index){
    return false;
  }

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