public void setGridLineColor(Color color) {
    Color oldValue = grid.getLineColor();
    if (oldValue != null && !oldValue.equals(color) || oldValue == null && color != null) {
      grid.setLineColor(color);
      firePropertyChange(GRID_LINE_COLOR_PROP, oldValue, color);
    }
  }
public void setGridLineColor(Color color)