WPF，获取窗体中的元素，哪里出错了？

<Window.Resources>

    <Style TargetType="Button">

        <Setter Property="Template">

            <Setter.Value>

                <ControlTemplate TargetType="Button">

                    <Border Name="border1">

                        <ContentPresenter />

                    </Border>

                </ControlTemplate>

            </Setter.Value>

        </Setter>

    </Style>

</Window.Resources>

<Border Name="border2">

    <Grid Name="grid1" HorizontalAlignment="Left" Width="596">     

        <Border Name="border3" />     

        <Button x:Name="button1" Content="Button" Click="Button_Click" Margin="217,303,258,155"/>   

    </Grid>

</Border>

private void Button_Click(object sender, RoutedEventArgs e)

{

    var count = VisualTreeHelper.GetChildrenCount(this);

    if (count > 0)

    {

        for (var i = 0; i < count; i++)

        {

            var child = VisualTreeHelper.GetChild(this, i);

            var t = child as Border;

            if (t != null)

                MessageBox.Show(t.Name);

        }

    }

}

1：上面代码，获取窗口中的Border元素，为什么没有搜出来呢？只搜了一个Name为空字符串的Border。