I've run into several instances where I just need to add a class to show or unhide something that isn't a modal. data-open appears to only work with the modal. There's data-closable to hide something, and data-toggler to hide/show. But I really just need to open an element once.
Right now I'm just rolling my own jQuery functions, but it would be super handy if I could use something already built into Foundation. I just can't seem to find it.