Thank you very much for your answer. I tested your solution and it works fine. I'm so sorry but I have one more question. I explain you my problem.
I created one new content type named cleanboy product to show products from commerce module. I installed too Display suite module to customize the cleanboy product display. Finally I copied et pasted your code into sites/all/modules/ds/layouts/ds_2col_stacked_fluid/ds-2col-stacked-fluid.tpl.php file and it works without problem.
But my new problem appears when I create one view to show all products. I see the link to collapse the paragrahp. When I click on "Show/Hide the following paragraph(s)" it collapses but it doesn't stay. Do you have any idea where is the problem?