@Override
  protected void prependActions(@NotNull DefaultActionGroup actionGroup) {
    actionGroup.add(new ViewClassHierarchyAction());
    actionGroup.add(new ViewSupertypesHierarchyAction());
    actionGroup.add(new ViewSubtypesHierarchyAction());
    actionGroup.add(new AlphaSortAction());
  }
@Override
  protected void prependActions(@NotNull DefaultActionGroup actionGroup)