How to use the get function ref for dojo grid 1.2

dojo_grid_get_usage.js

    var layout = [{
       cells: [[
             { name: ' ',
		get: getSubgridToggler,
               	style: 'text-align: center;',
				width: '18px',
				headerClasses:'expandHeader' }
       ]]
    }];

    function getSubgridToggler(inRowIndex,item) {
      if (!item) {
        return "";
      }
      return grid.store.getValue(item,"first_name") + " " +
                 grid.store.getValue(item,"last_name");
    
     }