Is it permissible to raise the hands and make du'a' at the graves of one's parents?

The questioner : Shaykh, some people come to the grave of their father, or their mother, or one of their relatives, or one of their deceased colleagues, and they raise their hands and make du'a', facing the qiblah, saying, "O Allah, expand his grave, O Allah, so and so, O Allah, so and so..." So, is it permissible to raise the hands in such a place, or to make du'a' in this manner, raising the hands and facing the qiblah, at the grave or in front of the grave?

The Shaykh : Sometimes it is permissible, because the Messenger of Allah (peace and blessings be upon him) did that when he visited al-Baqi' on the night of 'Aishah.

The questioner : Facing the qiblah, O Shaykh?

The Shaykh: Yes.