private static void scrollBy(int delta, GrTypeComboBox combo) {
    if (delta == 0) return;
    final int size = combo.getModel().getSize();
    int next = combo.getSelectedIndex() + delta;
    if (next < 0 || next >= size) {
      if (!UISettings.getInstance().getCycleScrolling()) {
        return;
      }
      next = (next + size) % size;
    }
    combo.setSelectedIndex(next);
  }
private static void scrollBy(int delta, GrTypeComboBox combo)