@Nullable
  public GrTypeElement setReturnType(@NlsSafe String returnType, GlobalSearchScope scope) {
    setReturnType(JavaPsiFacade.getInstance(myManager.getProject()).getElementFactory().createTypeByFQClassName(returnType, scope));
    return null;
  }
@Nullable
  public GrTypeElement setReturnType(@NlsSafe String returnType, GlobalSearchScope scope)