Make result buttons a button group and adopt styles

Change-Id: I703de5fcb5f7f19e84278a719a64c19c3bc016cc
diff --git a/dev/js/src/buttongroup.js b/dev/js/src/buttongroup.js
index b33c13a..a1dac7b 100644
--- a/dev/js/src/buttongroup.js
+++ b/dev/js/src/buttongroup.js
@@ -31,11 +31,11 @@
      */
     add : function (title, classes, cb) {
       var b = this._element.addE('span');
-      b.addT(title);
       b.setAttribute('title',title);
       if (classes !== undefined) {
         b.classList.add.apply(b.classList, classes);
       };
+      b.addE('span').addT(title);
 
       var that = this;
       b.addEventListener('click', function (e) {