Sharia is not complete during the prophet time

I would dispute the argument that the Sharia already existed during the time of the Prophet. I stand by my argument that the Sharia developed over hundreds of years after the death of Prophet Muhammad. For example, if the Sharia is based on four sources (the Qur'an, Sunnah, ijma, and qiyas) how can the Sharia had been already fully developed at the time of the Prophet when three of the four sources came after the death of the Prophet?

= http://mt.m2day.org/2008/content/view/28386/84/