[CLOSED] TreePanel Refresh server side

[John_Writers]

Hi,
I'm building a page to filter a treepanel server side.

Clicking on a button server side, I populate the tree with the following code:

//remove old nodes
            TreeFunctional.Root.Clear();

            var q = from myrow in dt.AsEnumerable()
                    where !myrow.Field<int?>("ID_INV_REGISTRY_PARENT").HasValue
                    select 
                        new
                        {
                            Description = myrow.Field<string>("Description")
                        ,   ID_INV_REGISTRY = myrow.Field<int?>("ID_INV_REGISTRY")
                        };
//load new nodes in the tree
            foreach (var r in q)
            {
                Ext.Net.Node root = new Ext.Net.Node()
                {
                    Text = r.Description
                };


                root.CustomAttributes.Add(new ConfigItem("ID_INV_REGISTRY", Convert.ToString(r.ID_INV_REGISTRY)));


                root.Children.AddRange(GetFunctionalChildNodes(dt, r.ID_INV_REGISTRY.Value));


                root.Expandable = root.Expanded = (root.Children.Count > 0);


                TreeFunctional.Root.Add(root);
            }
//render the content of the tree
            TreeFunctional.Render();

The treepanel is inside an accordion panel.

After I run this code, the treepanel stay clear without nodes, if I collapse and expand the treepanel inside the accordion panel, then I can see all the nodes in the tree.

I used the TreeFunctional.Render() method to render the treepanel after I populate it, but it seems to be not enough, so what method should I use to refresh the tree?

Thank you for your help.

Have a good day.