How to put multiple XML data in datagridview

using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Windows.Forms;
using System.Xml.Serialization;

namespace TestSerialization2
{
    /// <summary>
    /// Test master details DataGridView with complex class.
    /// Show details in dataGridViewDetails when row is selected.
    /// Allow serializing in XML format.
    /// </summary>
    public partial class Form2 : Form
    {
        public BindingList<XmlDriver> bindingList;
        public BindingList<XmlDriver.Ptz> bindingListDetail;
        private bool skipFirst;

        public Form2()
        {
            InitializeComponent();
        }

        private void buttonLoadXml_Click(object sender, EventArgs e)
        {
            bindingList = new BindingList<XmlDriver>();
            this.AddTestData();
            this.dataGridView1.AllowUserToAddRows = false;
            this.dataGridView1.RowEnter += this.dataGridView1_RowEnter;
        }

        private void AddTestData()
        {
            // Add rows with test data (this is only for testing normally data is read from an .xml file)
            var item = new XmlDriver("Brand1", "Test model1");
            item.Xptz = new XmlDriver.Ptz();   // Xptz is a subclass.
            bindingList.Add(item);

            item = new XmlDriver("Brand2", "Test model2");
            item.Xptz = new XmlDriver.Ptz(true, "Test zoomcommand2");   // Xptz is a subclass.
            //item.Save("test1.xml");
            bindingList.Add(item);

            this.dataGridView1.DataSource = bindingList;
        }

        /// <summary>
        /// When user selects a row, extract the Ptz class and show the details in dataGridViewDetails. 
        /// </summary>
        private void dataGridView1_RowEnter(object sender, DataGridViewCellEventArgs e)
        {
            if (skipFirst)
            {
                this.bindingListDetail = new BindingList<XmlDriver.Ptz>();
                this.bindingListDetail.AllowNew = false;
                var ptz = this.bindingList[e.RowIndex].Xptz;
                this.bindingListDetail.Add(ptz);
                this.dataGridViewDetails.DataSource = bindingListDetail;
            }

            skipFirst = true;
        }

        /// <summary>
        /// Class containing a subclass: Ptz.
        /// Note that Ptz is used in field Xptz, which is not a property.
        /// Only properties will be displayed in the master data grid.
        /// </summary>
        public class XmlDriver
        {
            public XmlDriver()
            {
                // needed for serialization.
            }

            public XmlDriver(string brand, string model)
            {
                this.Xbrand = brand;
                this.Xmodel = model;
            }

            // Properties for display in data grid.
            public string Xbrand { get; set; }
            public string Xmodel { get; set; }

            // Not a property !
            public Ptz Xptz;

            /// <summary>
            /// Saves to an xml file
            /// </summary>
            /// <param name="FileName">File path of the new xml file</param>
            public void Save(string FileName)
            {
                using (var writer = new System.IO.StreamWriter(FileName))
                {
                    var serializer = new XmlSerializer(this.GetType());
                    serializer.Serialize(writer, this);
                    writer.Flush();
                }
            }

            /// <summary>
            /// Load an object from an xml file
            /// </summary>
            /// <param name="FileName">Xml file name</param>
            /// <returns>The object created from the xml file</returns>
            public void Load(string FileName)
            {
                XmlDriver temp;

                using (var stream = System.IO.File.OpenRead(FileName))
                {
                    var serializer = new XmlSerializer(typeof(XmlDriver));
                    temp = serializer.Deserialize(stream) as XmlDriver;
                }

                this.Xbrand = temp.Xbrand;
                this.Xmodel = temp.Xmodel;
                this.Xptz = temp.Xptz;
            }

            public class Ptz
            {
                public Ptz()
                {
                    // needed for serialization.
                }

                public Ptz(bool enabled, string zoomCommand)
                {
                    this.Enabled = enabled;
                    this.ZoomCommand = zoomCommand;
                }

                public bool Enabled { get; set; }
                public string ZoomCommand { get; set; }
            }
        }
    }
}