TabControl Class

Partial Public Class Page
    Inherits UserControl

    Public Sub New()
        InitializeComponent()

        'Here we add TabItems to two TabControls, 
        'tab1 and tab2.
        Dim ti As New TabItem()
        ti.Header = "First TabItem!"
        ti.Content = "This is the first TabItem's content."
        tab1.Items.Add(ti)

        ti = New TabItem()
        ti.Header = "Second TabItem!"
        ti.Content = "This is the second TabItem's content."
        tab1.Items.Add(ti)

        ti = New TabItem()
        ti.Header = "Third TabItem!"
        ti.Content = "This is the third TabItem's content."
        tab1.Items.Add(ti)

        ti = New TabItem()
        ti.Header = "First TabItem!"
        ti.Content = "This is the first TabItem of the second TabControl."
        tab2.Items.Add(ti)

        ti = New TabItem()
        ti.Header = "Second TabItem!"
        ti.Content = "This is the second TabItem of the second TabControl."
        tab2.Items.Add(ti)

        ti = New TabItem()
        ti.Header = "Third TabItem!"
        ti.Content = "This is the third TabItem of the second TabControl."
        tab2.Items.Add(ti)

        'Set tab2's tab strip to run along the bottom of the 
        'TabControl, rather than the top. 
        tab2.TabStripPlacement = Dock.Bottom

    End Sub

    'This handler responds to the user changing the selected 
    'TabItem on tab2 by changing the selection on tab1 to 
    'match. 
    Private Sub tab2_SelectionChanged(ByVal sender As Object, ByVal e As SelectionChangedEventArgs) Handles tab2.SelectionChanged
        'Set the selected TabItem of tab1 to match tab2. 
        tab1.SelectedIndex = tab2.SelectedIndex
        'You can also use SelectedItem to progamatically set the 
        'selected TabItem. 
    End Sub
End Class

using System;
using System.Collections.Generic;
using System.Linq;
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;

namespace TabControlExample
{
    public partial class Page : UserControl
    {
        public Page()
        {
            InitializeComponent();

            //Here we add TabItems to two TabControls,
            //tab1 and tab2.
            TabItem ti = new TabItem();
            ti.Header = "First TabItem!";
            ti.Content = "This is the first TabItem's content.";
            tab1.Items.Add(ti);

            ti = new TabItem();
            ti.Header = "Second TabItem!";
            ti.Content = "This is the second TabItem's content.";
            tab1.Items.Add(ti);

            ti = new TabItem();
            ti.Header = "Third TabItem!";
            ti.Content = "This is the third TabItem's content.";
            tab1.Items.Add(ti);

            ti = new TabItem();
            ti.Header = "First TabItem!";
            ti.Content = "This is the first TabItem of the second TabControl.";
            tab2.Items.Add(ti);

            ti = new TabItem();
            ti.Header = "Second TabItem!";
            ti.Content = "This is the second TabItem of the second TabControl.";
            tab2.Items.Add(ti);

            ti = new TabItem();
            ti.Header = "Third TabItem!";
            ti.Content = "This is the third TabItem of the second TabControl.";
            tab2.Items.Add(ti);

            //Set tab2's tab strip to run along the bottom of the
            //TabControl, rather than the top.
            tab2.TabStripPlacement = Dock.Bottom;

            tab2.SelectionChanged += new SelectionChangedEventHandler(tab2_SelectionChanged);
        }

        //This handler responds to the user changing the selected
        //TabItem on tab2 by changing the selection on tab1 to
        //match.
        void tab2_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            //Set the selected TabItem of tab1 to match tab2.
            tab1.SelectedIndex = tab2.SelectedIndex;
            //You can also use SelectedItem to progamatically set the 
            //selected TabItem.
        }
    }
}

<!-- NOTE: 
  By convention, the sdk prefix indicates a URI-based XAML namespace declaration 
  for Silverlight SDK client libraries. This namespace declaration is valid for 
  Silverlight 4 only. In Silverlight 3, you must use individual XAML namespace 
  declarations for each CLR assembly and namespace combination outside the scope 
  of the default Silverlight XAML namespace. For more information, see the help 
  topic "Prefixes and Mappings for Silverlight Libraries". 
-->
<UserControl  xmlns:sdk="https://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" x:Class="TabControlExample.Page"
    xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml" 
    FontFamily="Trebuchet MS" FontSize="11"
    Width="400" Height="300">
    <Canvas x:Name="LayoutRoot" Background="White">

        <!-- Create a simple TabControl in XAML. -->
        <sdk:TabControl x:Name="tab1" Canvas.Top="20" Canvas.Left="20" Height="200" Width="300" />
        <sdk:TabControl x:Name="tab2" Canvas.Top="240" Canvas.Left="20" Height="200" Width="300" />

    </Canvas>
</UserControl>