private void doMoveDown(@JdkConstants.InputEventMask int modifiers) {
      if (myComponent instanceof JList) moveDown((JList<?>)myComponent, modifiers, isCycleScrolling());
      else if (myComponent instanceof JTable) moveDown((JTable)myComponent, modifiers, isCycleScrolling());
      else throw new IllegalArgumentException("MoveDown is not implemented for " + myComponent.getClass());
    }
private void doMoveDown(@JdkConstants.InputEventMask int modifiers)