How to select a particular row in grid?

I am trying to generate a user defined CFL form which should work exactly as system CFL. Using Matrix takes minutes to load the query's output so I m using grid instead and passing the query as a parameter to datatable. is there any way to select a particular row in grid through SDK ? for matrix , it cud be written like 'matrix.selectrow(). doesn't seem to have such property for grid. Any help on this will be appreciated.

Thank you..