i guess its at the option of director. qualifacition sahres are the minimum number of shares a person must own, as provided in the articles of the company, in order to qualify to become a director of the company.
this means that its only the requirement to become a director, but since he is also a member (shareholdr) of the company to hold or sell the sahres after retirement is completely at his will.
mean its just my logic. n as far as i have gone throught the Companies Act, there is no such requirement to surrender these shares