You can add it in your fragment code:
public class YourFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.your_fragment_layout, null);
if (getChildFragmentManager().findFragmentByTag("main") == null)
{
if (getActivity() == null)
return null;
FragmentTransaction ft = getChildFragmentManager().beginTransaction();
NewsMainFragment nf = (YourNested) YourNestedFragementClass.instantiate(getActivity(), YourNestedFragementClass.class.getName(),savedInstanceState);
ft.add(R.id.fragment_container, nf,"main");
ft.commit();
}
return v;
}
}