@Override
      public @NotNull Iterator<JComponent> iterator() {
        Iterable<JComponent> components = JBIterable.<Fragment>empty()
          .append(myPrimaryColumn.fragments)
          .append(mySecondaryColumn.fragments)
          .map(it -> it.myComponent);

        return components.iterator();
      }
@Override
      public @NotNull Iterator<JComponent> iterator()