Tabletool - add jquery ui icon in buttons (and display them as buttonset)

Hi and once again many thanks for this great plugin.

I am trying to implement the solution presented here : http://iksela.tumblr.com/post/2727627360/display-tabletools-buttons-as-jqueryui-buttons-with-an
The objective is to use Tabletool designed by jquery ui button and also to add jquery ui icon inside the buttons.
Here is my test case : http://live.datatables.net/ejudox/6/edit#preview
So as you can see the buttons are overlapping each other and the buttonset design (css classes) is not generated correctly.

I looked in the generated source code and I saw that all the buttons have ui-corner-all class (first one should have ui-corner-left and the second one should have ui-corner-right) (all other jquery classes are correct)

I also went in the source code of both tabletool and datatable but I didn't manage to find where this issue come from.
Any help would be very apreciated

regards