public override void handleMouseUp(Point mouseLocation, 
                                       PlayFrame frame,
                                       PitchScreenCoordConverter converter,
                                       VisualOverlay overlay)
        {
            PointF pitchCoords = converter.screenToPitchCoords(mouseLocation);

              Player closestPlayer = frame.GetClosestPlayer(pitchCoords,
                                                    Settings.Default.PlayerDiameter);

              if (closestPlayer != null)
              {
            frame.AddDisc(closestPlayer);

            IsComplete = true;
            ModelChanged = true;
              }
        }