code: public Border createComponentNodeBorder() {
          return BorderFactory.createCompoundBorder(
                  BorderFactory.createLineBorder(Color.LIGHT_GRAY),
                  BorderFactory.createEmptyBorder(3, 3, 3, 3));
      }
docs: Creates the border which surrounds component nodes.  By default,
  this is a light gray line border.
  @return The border, or <code>null</code> if there shouldn't be a
  border around component nodes.