Menu link with attributes

I need to create a menu link like this <a href="/?acquista" class="tickets_open" data-store="petrarca">Acquista</a>
 How can I add the attribute "data-store" in the link ?
Thanks
 

Hi
you can try a cheat code
go int he menu item >> maximenu ck params >> attribute rel >> write this :

" data-data-store="petrarca

this will write rel="" and add your data-store
but take care about the quotes, write them exactly as I do, without the closing one