I need reload a TreePanel, but the 'prepareToolbar' fails on reload, the 'record.data.type' are undefined, why?

@page
@model Project.Pages.ReloadTreePanelModel
@{
    Layout = null;
}

<head>
    <script type="text/javascript">
        var gridCommand = [{
            xtype: "button",
            text: "button 1",
            command: "commandbutton1",
        }, {
            xtype: "button",
            text: "button 2",
            command: "commandbutton2",
        }];

        var PrepareCommands = function (object, toolbar, rowIndex, record) {
            if (record.data.depth == 0) {
                toolbar.items.items[0].hide();
                toolbar.items.items[1].hide();
            }

            if (record.data.type == '1') {
                toolbar.items.items[1].hide();
            } else if (record.data.type == '2') {
                toolbar.items.items[0].hide();
            }
        };

        var columnModelTree = [{
            flex: 1,
            xtype: "treecolumn",
            dataIndex: "text",
        }, {
            width: 150,
            xtype: "commandcolumn",
            commands: gridCommand,
            prepareToolbar: PrepareCommands
        }];
    </script>
</head>


<body>
    <ext-viewport layout="Fit">
        <items>
            <ext-treePanel id="MyTreePanel" title="TreePanel" flex="1" frame="true" scrollable="true" margin="5" ui="Info">
                <tbar>
                    <ext-toolbar>
                        <items>
                            <ext-button id="MyButton1" text="Reload from server">
                                <directEvents>
                                    <click pageHandler="Button_Click" method="POST" success="App.MyTreePanel.store.setRoot(Ext.decode(response.responseText).result)">
                                        <eventMask>
                                            <ext-eventMask showMask="true" msg="Cargando..." />
                                        </eventMask>
                                    </click>
                                </directEvents>
                            </ext-button>
                            <ext-toolbarFill />
                        </items>
                    </ext-toolbar>
                </tbar>
                <store>
                    <ext-treeStore root="Model.Root">
                        <fields>
                            <ext-dataField name="type" />
                        </fields>
                    </ext-treeStore>
                </store>
                <customConfig>
                    <ext-add key="columns" value="columnModelTree" mode="Raw" />
                </customConfig>
            </ext-treePanel>
        </items>
    </ext-viewport>
</body>
cs:
using Ext.Net;
using Ext.Net.Core;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using System.Collections.Generic;

namespace Project.Pages {
    public class ReloadTreePanelModel : PageModel {

        public TreeNode Root = BuildTree();

        public void OnGet() {
        }

        private static TreeNode BuildNode(string name, string type) {
            TreeNode node = new TreeNode {
                Text = name,
                CustomConfig = new JsObject()
            };
            node.CustomConfig.Add("type", type);
            return node;
        }

        private static TreeNode BuildTree() {
            var root = new TreeNode() {
                Text = "Node 1",
                Children = new List<TreeNode> {
                    BuildNode("Node 1", "1"),
                    BuildNode("Node 2", "2"),
                    BuildNode("Node 3", "1"),
                    BuildNode("Node 4", "2"),
                    BuildNode("Node 5", "2"),
                    BuildNode("Node 6", "1"),
                }
            };
            return root;
        }

        public IActionResult OnPostButton_Click(int Nivel) {
            Root = new TreeNode() {
                Text = "Node 1",
                Children = new List<TreeNode> {
                    BuildNode("Node 1", "1"),
                    BuildNode("Node 2", "2"),
                    BuildNode("Node 3", "2"),
                }
            };
            this.X().Toast("OK");
            return this.Direct(Root);
        }
    }
}