@Override
  public void paintFeedback(Graphics2D g2d, Rectangle rc) {
    g2d.setColor(PlatformColors.BLUE);
    g2d.setStroke(new BasicStroke(1.5f));
    int right = rc.x + rc.width - 1;
    int bottom = rc.y + rc.height - 1;
    int midX = (int) rc.getCenterX();
    g2d.drawLine(rc.x, rc.y, midX, rc.y+GridInsertLocation.INSERT_ARROW_SIZE);
    g2d.drawLine(right, rc.y, midX, rc.y+GridInsertLocation.INSERT_ARROW_SIZE);
    g2d.drawLine(midX, rc.y+GridInsertLocation.INSERT_ARROW_SIZE,
                 midX, bottom-GridInsertLocation.INSERT_ARROW_SIZE);
    g2d.drawLine(rc.x, bottom, midX, bottom-GridInsertLocation.INSERT_ARROW_SIZE);
    g2d.drawLine(right, bottom, midX, bottom-GridInsertLocation.INSERT_ARROW_SIZE);
  }
@Override
  public void paintFeedback(Graphics2D g2d, Rectangle rc)