Tab Control in WPF of VS2008

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VS2008

C#

Visual-Studio

WPF

I am using Tab control in my application. At design time I am not moving on different tab item but at run time its work. It always comes on first tab. Is there any property of tabcontrol that I have to set?

<Window x:Class="DLL_TEACHER.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Teacher"  Height="700" Width="1300">
    <Canvas Width="1249">
        <Image Canvas.Left="0" Canvas.Top="0" Height="71" Name="image1" Stretch="Fill" Width="120" Source="D:\Software Development\vishal_wpf\vishal_WPF\DLL_2008_WPF\DLL_TEACHER\DLL_TEACHER\Images\logo.jpg" />
        <TabControl Canvas.Left="0" Canvas.Top="77" Height="572"  Width="1252"  Name="tabControl1">
            <TabItem Header="Student Status" Name="tabItem1" >
                this is one
            </TabItem>
            <TabItem Header="Lesson Assignment" Name="tabItem2" >
                this is two
            </TabItem>
            <TabItem Header="Lesson Preperation" Name="tabItem3" >
                <Grid>
                </Grid>
            </TabItem>
            <TabItem Header="Saved Lesson" Name="tabItem4" >
                <Grid>
                </Grid>
            </TabItem>
            <TabItem Header="chat" Name="tabItem5" >
                <Grid>
                </Grid>
            </TabItem>
        </TabControl>
    </Canvas>
</Window>