How to activate a tabbed modal?

How do you activate the tabs option on the modal screen? According to the Sweet Modal site, tabs are an option. I’ve tried various iterations, but can’t seem to get it to work (tab, tabs, in the options, and outside of the options. See below for one of the attempts.

        }, {
        "actions": [{
            "action": "showModal",
            "options": {
                "body": "This is a modal!",
                "overlayTheme": "light",
                "tabs": [{
                    "id": "1",
                    "title": "this is tab 1"
                }, {
                    "id": "2",
                    "title": "this is tab 2"
                "text": "Welcome User",
                "slots": []
        "buttonClasses": "btn btn-info",
        "styleClasses": "col-md-2",
        "text": "Push Me",
        "type": "button"