gistfile1.txt

 .yui3-skin-sam .yui3-datatable tr.myhilite td {  background-color: #C0ffc0;  }


  var dt = new Y.DataTable({....});

  dt.delegate("click",function(e){
     var tr = e.target;

     tr.addClass("myhilite");

     
  }, "tr", dt);