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);
     },
diff --git a/dev/js/src/panel/match.js b/dev/js/src/panel/match.js
index 6a3fe57..33e7dc9 100644
--- a/dev/js/src/panel/match.js
+++ b/dev/js/src/panel/match.js
@@ -27,6 +27,8 @@
   loc.ADDTREE   = loc.ADDTREE   || 'Relations';
 
   return {
+    type : 'match',
+    
     create : function (match) {
       return Object.create(panelClass)._init(['matchinfo']).upgradeTo(this)._init(match);
     },
diff --git a/dev/js/src/panel/pagination.js b/dev/js/src/panel/pagination.js
index f084e51..dd3331c 100644
--- a/dev/js/src/panel/pagination.js
+++ b/dev/js/src/panel/pagination.js
@@ -19,6 +19,8 @@
 
   
   return {
+    type : 'pagination',
+
     create : function () {
       return Object.create(panelClass)._init(['pagination']).upgradeTo(this)._init();
     },
diff --git a/dev/js/src/panel/query.js b/dev/js/src/panel/query.js
index a4658b0..0eca1b7 100644
--- a/dev/js/src/panel/query.js
+++ b/dev/js/src/panel/query.js
@@ -15,6 +15,8 @@
   const loc = KorAP.Locale;
   
   return {
+    type : 'query',
+
     create : function (opened) {
       return Object.create(panelClass)._init(['query']).upgradeTo(this)._init(opened);
     },
diff --git a/dev/js/src/panel/result.js b/dev/js/src/panel/result.js
index 94ab856..7d771ad 100644
--- a/dev/js/src/panel/result.js
+++ b/dev/js/src/panel/result.js
@@ -20,6 +20,8 @@
   const aRoll = ['left', 'right','center'];
   
   return {
+    type : 'result',
+    
     create : function (opened) {
       return Object.create(panelClass)._init(['result']).upgradeTo(this)._init(opened);
     },
diff --git a/dev/js/src/panel/vc.js b/dev/js/src/panel/vc.js
index b9dc7a2..4ce7a5d 100644
--- a/dev/js/src/panel/vc.js
+++ b/dev/js/src/panel/vc.js
@@ -22,6 +22,8 @@
   loc.VERB_SHOWSTAT = loc.VERB_SHOWSTAT    || 'Corpus Statistics';
   
   return {
+    type : 'vc',
+    
     create : function (vc) {
       return Object.create(panelClass)._init(['vcinfo']).upgradeTo(this)._init(vc);
     },