Title

            <button id="hinted_button"
                class="button primary"
                data-role="hint"
                data-hint="Initial hint">Hinted button</button>

            <button class="button" onclick="setHintMessage('Hint 1')">Set hint 1</button>

            <script>
            function setHintMessage(msg){
                $('#hinted_button').data('hint', msg);
            }
            </script>