   <button class="sd-button" data-click="#extras_nav">
                            <div data-selector="#extras_tab" data-parent-selector="#tab_control" droppable="true" class="portal invisible">
                              <div class="mask-icon icon-2extras"></div>
                            </div>
                          </button>
                          <button class="sd-button" data-click="#caption_nav">
                            <div data-selector="#caption_tab" data-parent-selector="#tab_contr