@Override
  public void setBackground(final Color bg) {
    super.setBackground(bg);

    if (this.inner != null) this.inner.setBackground(bg);

    if (this.coxeter != null) this.coxeter.setBackground(bg);

    if (this.schoenflies != null) this.schoenflies.setBackground(bg);

    if (this.orbifold != null) this.orbifold.setBackground(bg);

    if (this.order != null) this.order.setBackground(bg);
  }