@Override
  protected void prependActions(@NotNull DefaultActionGroup actionGroup) {
    actionGroup.add(new ChangeViewTypeActionBase(IdeBundle.message("action.caller.methods.hierarchy"),
                                                 IdeBundle.message("action.caller.methods.hierarchy"),
                                                 AllIcons.Hierarchy.Supertypes, getCallerType()));
    actionGroup.add(new ChangeViewTypeActionBase(IdeBundle.message("action.callee.methods.hierarchy"),
                                                 IdeBundle.message("action.callee.methods.hierarchy"),
                                                 AllIcons.Hierarchy.Subtypes, getCalleeType()));
    actionGroup.add(new AlphaSortAction());
    actionGroup.add(new ChangeScopeAction());
  }
@Override
  protected void prependActions(@NotNull DefaultActionGroup actionGroup)