How to access the tab header name?

Experts
I want to get the name of the header name of the tab while clicking the tab .
The code by which I am creating the new tab is as followes:
private void mnuSave_Click(object sender, Telerik.Windows.RadRoutedEventArgs e)
        {
            try
            {
                this.txtTabName.Text = string.Empty;
                winNewTabname.Header = "Set Name of Tab";
                winNewTabname.Top = this._mousePosition.Y;
                winNewTabname.Left = this._mousePosition.X - 200;
                winNewTabname.WindowStartupLocation = WindowStartupLocation.Manual;
                winNewTabname.ResizeMode = ResizeMode.NoResize;
                winNewTabname.Closed += new EventHandler<WindowClosedEventArgs>(winNewTabname_Closed);
                winNewTabname.ShowDialog();
            }
            catch (Exception ex)
            {
                Globals.HandleUIExceptions(ex);
            }
        }
        private void winNewTabname_Closed(object sender, WindowClosedEventArgs e)
        {
            if (e.DialogResult == true && !string.IsNullOrEmpty(this.txtTabName.Text.Trim()))
            {
                var found = from Object obj in tabNotes.Items
                            where (obj as RadTabItem).Header.ToString() == this.txtTabName.Text.Trim()
                            select obj;

                if (found.ToList().Count == 0)
                {
                    RadTabItem tabItem = new RadTabItem();
                    tabItem.Tag = this.txtTabName.Text;
                    tabItem.Header = this.txtTabName.Text;
                    tabNotes.Items.Add(tabItem);
                    this.tabNotes.SelectedIndex = tabNotes.Items.Count - 1;
                    RadContextMenu.SetContextMenu(tabItem, _ContextMenu);
                }
                else
                {

                    this.tabNotes.SelectedItem = found.ToList()[0] as RadTabItem;
                }
            }
        }

Now please suggest me how to get the tag name
 

private void mnuSave_Click(object sender, Telerik.Windows.RadRoutedEventArgs e)
        {
            try
            {
                this.txtTabName.Text = string.Empty;
                winNewTabname.Header = "Set Name of Tab";
                winNewTabname.Top = this._mousePosition.Y;
                winNewTabname.Left = this._mousePosition.X - 200;
                winNewTabname.WindowStartupLocation = WindowStartupLocation.Manual;
                winNewTabname.ResizeMode = ResizeMode.NoResize;
                winNewTabname.Closed += new EventHandler<WindowClosedEventArgs>(winNewTabname_Closed);
                winNewTabname.ShowDialog();
            }
            catch (Exception ex)
            {
                Globals.HandleUIExceptions(ex);
            }
        }
        private void winNewTabname_Closed(object sender, WindowClosedEventArgs e)
        {
            if (e.DialogResult == true && !string.IsNullOrEmpty(this.txtTabName.Text.Trim()))
            {
                var found = from Object obj in tabNotes.Items
                            where (obj as RadTabItem).Header.ToString() == this.txtTabName.Text.Trim()
                            select obj;

                if (found.ToList().Count == 0)
                {
                    RadTabItem tabItem = new RadTabItem();
                    tabItem.Tag = this.txtTabName.Text;
                    tabItem.Header = this.txtTabName.Text;
                    tabNotes.Items.Add(tabItem);
                    this.tabNotes.SelectedIndex = tabNotes.Items.Count - 1;
                    RadContextMenu.SetContextMenu(tabItem, _ContextMenu);
                }
                else
                {

                    this.tabNotes.SelectedItem = found.ToList()[0] as RadTabItem;
                }
            }
        }
        private void winRenameTabname_Closed(object sender, WindowClosedEventArgs e)
        {
         }


//here is the full code 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Telerik.Windows.Controls;
using UBS.Rx.Presentation.Common;

namespace UBS.Rx.Presentation.UI.Moola
{
    public partial class TabbedNotesControl : UserControl
    {
        Notes _Notes;
        double _Height, _Width;
        int _Selectedindex = -1;
        Point _mousePosition = new Point(0, 0);
        RadContextMenu _ContextMenu;

        public TabbedNotesControl()
        {
            InitializeComponent();
            _Notes = new Notes();
            StyleManager.SetTheme(this.tabNotes, ThemeManager.FromName(Globals.MoolaThemeName));
            this.tabNotes.SelectionChanged += new RoutedEventHandler(tabNotes_SelectionChanged);
            mnuSave.Click += new Telerik.Windows.RadRoutedEventHandler(mnuSave_Click);
            this.txtTabName.KeyDown += new KeyEventHandler(txtTabName_KeyDown);
            this.MouseMove += new MouseEventHandler(TabbedNotesControl_MouseMove);
            _ContextMenu = new RadContextMenu();
            RadMenuItem mnuTabItemAdd = new RadMenuItem() { Name = "mnuTabItemAdd", Header = "Add a new tab" };
            _ContextMenu.Items.Add(mnuTabItemAdd);
            mnuTabItemAdd.Click += new Telerik.Windows.RadRoutedEventHandler(mnuSave_Click);


            RadMenuItem mnuTabItemRemove = new RadMenuItem() { Name = "mnuTabItemRemove", Header = "Remove tab" };
            _ContextMenu.Items.Add(mnuTabItemRemove);
            mnuTabItemRemove.Click += new Telerik.Windows.RadRoutedEventHandler(mnuTabItemRemove_Click);

            RadMenuItem mnuTabItemRename = new RadMenuItem() { Name = "mnuTabItemRename", Header = "Rename tab" };
            _ContextMenu.Items.Add(mnuTabItemRename);
            mnuTabItemRename.Click += new Telerik.Windows.RadRoutedEventHandler(mnuTabItemRename_Click);
        }

        private void mnuTabItemRename_Click(object sender, Telerik.Windows.RadRoutedEventArgs e)
        {
            //Rename
            try
            {
                this.txtTabName.Text = string.Empty;
                winNewTabname.Header = "Rename Tab";
                winNewTabname.Top = this._mousePosition.Y;
                winNewTabname.Left = this._mousePosition.X - 200;
                winNewTabname.WindowStartupLocation = WindowStartupLocation.Manual;
                winNewTabname.ResizeMode = ResizeMode.NoResize;
                winNewTabname.Closed += new EventHandler<WindowClosedEventArgs>(winRenameTabname_Closed);
                winNewTabname.ShowDialog();
            }
            catch (Exception ex)
            {
                Globals.HandleUIExceptions(ex);
            }
        }

        private void mnuTabItemRemove_Click(object sender, Telerik.Windows.RadRoutedEventArgs e)
        {
           //Remove
        }

        private void TabbedNotesControl_MouseMove(object sender, MouseEventArgs e)
        {
            try
            {
                _mousePosition = e.GetPosition(null);
            }
            catch
            {

            }
        }

        void txtTabName_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Enter)
            {
                this.winNewTabname.DialogResult = true;
                this.winNewTabname.Close();

            }
            else if (e.Key == Key.Escape)
            {
                this.winNewTabname.DialogResult = false;
                this.winNewTabname.Close();
            }
        }

        private void mnuSave_Click(object sender, Telerik.Windows.RadRoutedEventArgs e)
        {
            try
            {
                this.txtTabName.Text = string.Empty;
                winNewTabname.Header = "Set Name of Tab";
                winNewTabname.Top = this._mousePosition.Y;
                winNewTabname.Left = this._mousePosition.X - 200;
                winNewTabname.WindowStartupLocation = WindowStartupLocation.Manual;
                winNewTabname.ResizeMode = ResizeMode.NoResize;
                winNewTabname.Closed += new EventHandler<WindowClosedEventArgs>(winNewTabname_Closed);
                winNewTabname.ShowDialog();
            }
            catch (Exception ex)
            {
                Globals.HandleUIExceptions(ex);
            }
        }
        private void winNewTabname_Closed(object sender, WindowClosedEventArgs e)
        {
            if (e.DialogResult == true && !string.IsNullOrEmpty(this.txtTabName.Text.Trim()))
            {
                var found = from Object obj in tabNotes.Items
                            where (obj as RadTabItem).Header.ToString() == this.txtTabName.Text.Trim()
                            select obj;

                if (found.ToList().Count == 0)
                {
                    RadTabItem tabItem = new RadTabItem();
                    tabItem.Tag = this.txtTabName.Text;
                    tabItem.Header = this.txtTabName.Text;
                    tabNotes.Items.Add(tabItem);
                    this.tabNotes.SelectedIndex = tabNotes.Items.Count - 1;
                    RadContextMenu.SetContextMenu(tabItem, _ContextMenu);
                }
                else
                {

                    this.tabNotes.SelectedItem = found.ToList()[0] as RadTabItem;
                }
            }
        }
        private void winRenameTabname_Closed(object sender, WindowClosedEventArgs e)
        {
            

            ////if (e.DialogResult == true && !string.IsNullOrEmpty(this.txtTabName.Text.Trim()))
            ////{
            //    var found = from Object obj in tabNotes.Items
            //                where (obj as RadTabItem).Header.ToString() == this.txtTabName.Text.Trim()
            //                select obj;
            //    string oldtabname = found.ToString();
            //    a = this.txtTabName.Text;
            //    header
            //    (obj as RadTabItem).Header.ToString() = oldtabname;
            //    if (found.ToList().Count == 0)
            //    {
            //        RadTabItem tabItem = new RadTabItem();
            //        tabItem.Tag = this.txtTabName.Text;
            //        tabItem.Header = this.txtTabName.Text;
            //        tabNotes.Items.Add(tabItem);
            //        this.tabNotes.SelectedIndex = tabNotes.Items.Count - 1;
            //        RadContextMenu.SetContextMenu(tabItem, _ContextMenu);
            //    }
            //    else
            //    {

            //        this.tabNotes.SelectedItem = found.ToList()[0] as RadTabItem;
            //    }
            ////}
        }
        void tabNotes_SelectionChanged(object sender, RoutedEventArgs e)
        {

            if (_Selectedindex > -1)
            {
                (tabNotes.Items[_Selectedindex] as RadTabItem).Content = null;
            }
            RadTabItem tabItem = this.tabNotes.SelectedItem as RadTabItem;
            _Notes.setDimestion(_Height, _Width);
            tabItem.Content = _Notes;
            _Notes.TabName = Convert.ToString(tabItem.Header);
            _Notes.LoadNotes(Convert.ToString(tabItem.Header));
            _Selectedindex = this.tabNotes.SelectedIndex;
        }

        public TabbedNotesControl(int noOfTabs)
            : this() //Here also we can pass type for the commensts also.
        {

            RadTabItem tabItem = new RadTabItem();
            tabItem.Tag = "Comments";
            tabItem.Header = "Comments";
            tabNotes.Items.Add(tabItem);
            RadContextMenu.SetContextMenu(tabItem, _ContextMenu);
        }

        public void setDimestion(double height, double width)
        {
            _Height = this.LayoutRoot.MaxHeight = this.LayoutRoot.Height = height;
            _Width = this.LayoutRoot.MaxWidth = this.LayoutRoot.Width = width;
            this.tabNotes.SelectedIndex = 0;
        }
    }
}

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