Add panel types

Change-Id: I27692ae25756924993a0b1843d8227fa83c590f8
diff --git a/dev/js/src/panel.js b/dev/js/src/panel.js
index 63eea6c..a79fad7 100644
--- a/dev/js/src/panel.js
+++ b/dev/js/src/panel.js
@@ -10,6 +10,8 @@
 define(['buttongroup', 'util'], function (buttonGroupClass) {
 
   return {
+    type : 'base',
+    
     create : function (classes) {
       return Object.create(this)._init(classes);
     },