How to use pagination on codeignator datagrid??

Question

Dear all, Below is my code.Can anybody guide me how can i use pagination on data grid in codeignator??

function viewAllList()
 {
   $sql = '(SELECT id,songName,albumName,artistName,category FROM tbl_rbt )as abc';
   $getInstance = & get_instance();
   $getInstance->load->library('rapyd');
   $this->rapyd->load('datagrid');  
   $grid = new DataGrid('', $sql);
   $grid->column('Song Name', 'songName', 'align=\'left\'');
   $grid->column('Album Name','albumName', 'align=\'left\'');
   $grid->column('Artist Name','artistName', 'align=\'left\'');
   $grid->column('Category', 'category', 'align=\'left\'');
   $linkshow = anchor('admin_controller/editRbt/<#id#>', 'Edit');
   $linkshow .= ' ' . anchor('admin_controller/deleteRbt/<#id#>', 'Delete', 'onclick = "return checkDelete();"'); 
   $grid->column('Actions', $linkshow,'align=\'left\' width="100px"');           
   $grid->build();
   return $grid->output;
 }

I need urgent help.Pls help

Thanks in advance

Riad