Change buttonGroup API to accept various information in data parameter

Change-Id: I0c3eb998d9be04fd1e7955b6c412277ec44755aa
diff --git a/dev/js/src/panel/vc.js b/dev/js/src/panel/vc.js
index 39deef5..978c442 100644
--- a/dev/js/src/panel/vc.js
+++ b/dev/js/src/panel/vc.js
@@ -28,7 +28,7 @@
      this.vc = vc;
      var actions = this.actions;
      var that = this;
-     actions.add(loc.SHOW_STAT, [ 'statistic' ], function() {
+      actions.add(loc.SHOW_STAT, {'cls':['statistic']}, function() {
        that.addCorpStat();
       });