Using your example https://mvc2.ext.net/#/GridPanel_Col...Configuration/ and using the "RowEditing" plugin, when a column is inserted the editor does not work.

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using Ext.Net;
using Ext.Net.MVC;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace POS.Controllers
{
    public class Companies
    {
        public static IEnumerable GetAllCompanies()
        {
            return new object[]
                {
                    new object[] { "3m Co", 71.72, 0.02, 0.03, "9/1 12:00am" },
                    new object[] { "Alcoa Inc", 29.01, 0.42, 1.47, "9/1 12:00am" },
                    new object[] { "Altria Group Inc", 83.81, 0.28, 0.34, "9/1 12:00am" },
                    new object[] { "American Express Company", 52.55, 0.01, 0.02, "9/1 12:00am" },
                    new object[] { "American International Group, Inc.", 64.13, 0.31, 0.49, "9/1 12:00am" },
                    new object[] { "AT&T Inc.", 31.61, -0.48, -1.54, "9/1 12:00am" },
                    new object[] { "Boeing Co.", 75.43, 0.53, 0.71, "9/1 12:00am" },
                    new object[] { "Caterpillar Inc.", 67.27, 0.92, 1.39, "9/1 12:00am" },
                    new object[] { "Citigroup, Inc.", 49.37, 0.02, 0.04, "9/1 12:00am" },
                    new object[] { "E.I. du Pont de Nemours and Company", 40.48, 0.51, 1.28, "9/1 12:00am" },
                    new object[] { "Exxon Mobil Corp", 68.1, -0.43, -0.64, "9/1 12:00am" },
                    new object[] { "General Electric Company", 34.14, -0.08, -0.23, "9/1 12:00am" },
                    new object[] { "General Motors Corporation", 30.27, 1.09, 3.74, "9/1 12:00am" },
                    new object[] { "Hewlett-Packard Co.", 36.53, -0.03, -0.08, "9/1 12:00am" },
                    new object[] { "Honeywell Intl Inc", 38.77, 0.05, 0.13, "9/1 12:00am" },
                    new object[] { "Intel Corporation", 19.88, 0.31, 1.58, "9/1 12:00am" },
                    new object[] { "International Business Machines", 81.41, 0.44, 0.54, "9/1 12:00am" },
                    new object[] { "Johnson & Johnson", 64.72, 0.06, 0.09, "9/1 12:00am" },
                    new object[] { "JP Morgan & Chase & Co", 45.73, 0.07, 0.15, "9/1 12:00am" },
                    new object[] { "McDonald\"s Corporation", 36.76, 0.86, 2.40, "9/1 12:00am" },
                    new object[] { "Merck & Co., Inc.", 40.96, 0.41, 1.01, "9/1 12:00am" },
                    new object[] { "Microsoft Corporation", 25.84, 0.14, 0.54, "9/1 12:00am" },
                    new object[] { "Pfizer Inc", 27.96, 0.4, 1.45, "9/1 12:00am" },
                    new object[] { "The Coca-Cola Company", 45.07, 0.26, 0.58, "9/1 12:00am" },
                    new object[] { "The Home Depot, Inc.", 34.64, 0.35, 1.02, "9/1 12:00am" },
                    new object[] { "The Procter & Gamble Company", 61.91, 0.01, 0.02, "9/1 12:00am" },
                    new object[] { "United Technologies Corporation", 63.26, 0.55, 0.88, "9/1 12:00am" },
                    new object[] { "Verizon Communications", 35.57, 0.39, 1.11, "9/1 12:00am" },
                    new object[] { "Wal-Mart Stores, Inc.", 45.45, 0.73, 1.63, "9/1 12:00am" }
                };
        }
    }
    public class TestController : Controller
    {
        public ActionResult Index()
        {
            return View(Companies.GetAllCompanies());
        }

        public ActionResult ToggleChange(bool pressed)
        {
            Column c = this.GetCmp<Ext.Net.Column>("ChangeColumn");
            c.Hidden = pressed;

            return new AjaxResult();
        }

        public ActionResult ChangeHeader()
        {
            Column c = this.GetCmp<Ext.Net.Column>("CompanyColumn");
            c.Text = "New label";

            return new AjaxResult();
        }

        public ActionResult ChangeWidth()
        {
            Column c = this.GetCmp<Ext.Net.Column>("PriceColumn");
            c.Width = 75;

            return new AjaxResult();
        }

        public ActionResult ChangeRenderer()
        {
            Column c = this.GetCmp<Ext.Net.Column>("ChangeColumn");
            Renderer r = new Renderer();
            r.Fn = "change";
            c.Renderer = r;

            return new AjaxResult();
        }

        public ActionResult AddColumn()
        {
            Store store = this.GetCmp<Store>("Store1");
            Ext.Net.GridPanel grid = this.GetCmp<Ext.Net.GridPanel>("GridPanel1");

            ModelField field = new ModelField("pctChange", ModelFieldType.Float);

            store.AddField(field, 3);

            store.LoadData(Companies.GetAllCompanies());

            Column col = new Column();
            col.ID = "pctChangeColumn";
            col.Text = "Change %";
            col.Width = 75;
            col.Sortable = true;
            col.DataIndex = "pctChange";
            col.Renderer.Fn = "pctChange";

            ComboBox cb = new ComboBox() { ID = "ComboBox1" };
            cb.Items.Add(new Ext.Net.ListItem("1", "1"));
            cb.Items.Add(new Ext.Net.ListItem("2", "2"));
            cb.Items.Add(new Ext.Net.ListItem("3", "3"));

            col.Editor.Add(cb);

            grid.AddColumn(col);

            return this.Direct();
        }

        public ActionResult InsertColumn()
        {
            Ext.Net.GridPanel grid = this.GetCmp<Ext.Net.GridPanel>("GridPanel1");

            DateColumn col = new DateColumn
            {
                Text = "Last Updated",
                Width = 85,
                Sortable = true,
                DataIndex = "lastChange",
                Format = "M/d/yyyy"
            };

            grid.InsertColumn(1, col);

            return this.Direct();
        }
    }
}


@model System.Collections.IEnumerable


@{
    Layout = null;
    var X = Html.X();
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
    <script>
        var template = '<span style="color:{0};">{1}</span>';

        var change = function (value) {
            return Ext.String.format(template, (value > 0) ? "green" : "red", value);
        };

        var pctChange = function (value) {
            return Ext.String.format(template, (value > 0) ? "green" : "red", value + "%");
        };
    </script>  
</head>
<body>
    <div> 
        <h1>Columns model ajax operation</h1>

        @Html.X().ResourceManager(this.ViewBag.ManagerConfig as MvcResourceManagerConfig)

        @(Html.X().GridPanel()
        .ID("GridPanel1")
        .Title("Array Grid")
        .Width(1000)
        .Height(500)
        .Store(Html.X().Store()
            .ID("Store1")
            .Model(Html.X().Model()
                .Fields(
                    new ModelField("company"),
                    new ModelField("price", ModelFieldType.Float),
                    new ModelField("change", ModelFieldType.Float),
                    new ModelField("pctChange", ModelFieldType.Float),
                    new ModelField("lastChange", ModelFieldType.Date, "M/d hh:mmtt")
                )
            )
            .DataSource(Model)
        )
        .ColumnModel(
            Html.X().Column().ID("CompanyColumn").Text("Company").DataIndex("company").Flex(1).Editor(X.TextField()),
            Html.X().Column().ID("PriceColumn").Text("Price").DataIndex("price").Renderer(RendererFormat.UsMoney),
            Html.X().Column().ID("ChangeColumn").Text("Change").DataIndex("change")
        )
        .Plugins(p => p.Add(X.RowEditing().ID("roweditor").ErrorSummary(true).ClicksToEdit(2).SaveBtnText("Save").CancelBtnText("Cancel").Listeners(l => l.CancelEdit.Handler = "if(e.record.phantom){e.store.remove(e.record);}")))
        .BottomBar(Html.X().Toolbar()
            .Items(
                Html.X().ToolbarFill(),
                Html.X().Button().Text("Change Header")
                    .DirectEvents(de =>
                    {
                        de.Click.Url = Url.Action("ChangeHeader");
                        de.Click.Single = true;
                        de.Click.Success = "this.disable();";
                    }),
                Html.X().Button().Text("Change Width")
                    .DirectEvents(de =>
                    {
                        de.Click.Url = Url.Action("ChangeWidth");
                        de.Click.Single = true;
                        de.Click.Success = "this.disable();";
                    }),
                Html.X().Button().Text("Change Renderer")
                    .DirectEvents(de =>
                    {
                        de.Click.Url = Url.Action("ChangeRenderer");
                        de.Click.Single = true;
                        de.Click.Success = "this.disable(); this.up('gridpanel').getView().refresh(false);";
                    }),
                Html.X().Button().Text("Hide 'Change'")
                    .EnableToggle(true)
                    .DirectEvents(de =>
                    {
                        de.Click.Url = Url.Action("ToggleChange");
                        de.Click.ExtraParams.Add(new
                        {
                            pressed = new JRawValue("this.pressed")
                        });
                    }),
                Html.X().Button().Text("Add Column")
                    .DirectEvents(de =>
                    {
                        de.Click.Url = Url.Action("AddColumn");
                        de.Click.Single = true;
                        de.Click.Success = "this.disable();";
                    }),
                Html.X().Button().Text("Insert Column")
                    .DirectEvents(de =>
                    {
                        de.Click.Url = Url.Action("InsertColumn");
                        de.Click.Single = true;
                        de.Click.Success = "this.disable();";
                    })
            )
        )

        )
    </div>
</body>
</html>