@Override
  protected @NotNull WizardPopup createPopup(WizardPopup parent, PopupStep step, Object parentValue) {
    if (step instanceof MyBasePopupState) {
      //noinspection unchecked
      return new ComboBoxPopup<>(myContext, parent, (MyBasePopupState<T>)step, parentValue);
    }

    throw new IllegalArgumentException(step.getClass().toString());
  }
@Override
  protected @NotNull WizardPopup createPopup(WizardPopup parent, PopupStep step, Object parentValue)