I then made a table, each cells contains a subform, with the data to display and an hidden checkbox. I then use JS to detect if the checkbox is checked, and if true, fill it in gray, and repeat that for each cells.
I know my question is pretty hazy, but do you have an another, simplier, way of doing that? (especially without the subform, that ruin the render for multiple line data, haven't managed to get something clean for now).
Thanks for your time and your answer.
(English is not my best, please excuse any errors, and correct me if you want :))