Make actions private in panels and views

Change-Id: I3f2c68c6e51525bbba96c24c4fddf9f9498333b1
diff --git a/dev/js/src/buttongroup/menu.js b/dev/js/src/buttongroup/menu.js
index 32ba0eb..4a4abfc 100644
--- a/dev/js/src/buttongroup/menu.js
+++ b/dev/js/src/buttongroup/menu.js
@@ -3,6 +3,9 @@
  */
 "use strict";
 
+// TODO:
+//   Add addToggle() method
+
 define(['menu'], function (menuClass) {
 
   return {