Thank you for the quick response!
but i still think that something doesn't word properly:
http://jsfiddle.net/6whkzm47/3/I need the columns : Item Id, Product and Unit Cost to be grouped by the "Item Detailssss" header column, so Iv'e made it colspan 3.
But instead, it's grouping by the 3 first
shown columns as you can see in the example.
Thanks in advance.