code: function _setLabel($btn, text, style, tooltip) {
          // Clear text/styles from previous status
          $("span", $btn).remove();
          $btn.removeClass(_allStatusStyles);
  
          // Set text/styles for new status
          if (text && text.length > 0) {
              $("<span class=\"label\">")
                  .addClass(style)
                  .text(text)
                  .appendTo($btn);
          } else {
              $btn.addClass(style);
          }
  
          if (tooltip) {
              $btn.attr("title", tooltip);
          }
      }
docs: Change the appearance of a button. Omit text to remove any extra text; omit style to return to default styling;
  omit tooltip to leave tooltip unchanged.