diff --git a/source/Ox.UI/js/List/TreeList.js b/source/Ox.UI/js/List/TreeList.js
index 4c8c1f9c..a72abc52 100644
--- a/source/Ox.UI/js/List/TreeList.js
+++ b/source/Ox.UI/js/List/TreeList.js
@@ -34,7 +34,8 @@ Ox.TreeList = function(options, self) {
             .options(options || {})
             .update({
                 data: function() {
-                    // ...
+                    self.options.items = getItems();
+                    self.$list.options({items: parseItems()});
                 },
                 selected: function() {
                     //self.$list.options({selected: self.options.selected});
@@ -47,10 +48,7 @@ Ox.TreeList = function(options, self) {
             });
 
     if (self.options.data) {
-        self.options.items = [];
-        Ox.sort(Object.keys(self.options.data)).forEach(function(key) {
-            self.options.items.push(parseData(key, self.options.data[key]));
-        });
+        self.options.items = getItems();
     }
 
     that.setElement(
@@ -155,6 +153,14 @@ Ox.TreeList = function(options, self) {
         return ret;
     }
 
+    function getItems() {
+        var items = [];
+        Ox.sort(Object.keys(self.options.data)).forEach(function(key) {
+            items.push(parseData(key, self.options.data[key]));
+        });
+        return items;
+    }
+
     function getParent(id, items) {
         var ret;
         Ox.forEach(items, function(item) {
@@ -207,7 +213,7 @@ Ox.TreeList = function(options, self) {
                     level: level
                 }, item, item.items
                     ? {
-                        items: !!item.expanded
+                        items: item.expanded
                             ? parseItems(item.items, level + 1)
                             : []
                     }