@Html.DevExpress().ComboBox(
    settings => {
        settings.Name = "comboBox4";
        settings.Width = 180;
        settings.SelectedIndex = 0;
        settings.Properties.DropDownWidth = 550;
        settings.Properties.DropDownStyle = DropDownStyle.DropDownList;
        settings.CallbackRouteValues = new { Controller = "Editors", Action = "MultiColumnComboBoxPartial" };
        settings.Properties.CallbackPageSize = 30;
        settings.Properties.IncrementalFilteringMode = IncrementalFilteringMode.StartsWith;
        settings.Properties.TextFormatString = "{0}";
        settings.Properties.ValueField = "CustomerID";
        settings.Properties.ValueType = typeof(string);

        settings.Properties.Columns.Add("ContactName", "ContactName", 130);
        settings.Properties.Columns.Add("CompanyName", "CompanyName", Unit.Percentage(100));
        settings.Properties.Columns.Add("Country", "Country", 60);
        settings.Properties.Columns.Add("Phone", "Phone", 100);
    }
).BindList(ViewData["Customers"]).GetHtml()