[TemplatePart(Name = TitleTextBlockKey, Type = typeof(TextBlock))]

    public class TitleTextBox : TextBox

    {
private const string TitleTextBlockKey = "PART_TitleTextBlock";

        private TextBlock _tbkTitle;

        public static readonly DependencyProperty TitleProperty;

        public string Title

        {

            get { return (string)GetValue(TitleProperty); }

            set { SetValue(TitleProperty, value); }

        }

        static TitleTextBox()

        {

            DefaultStyleKeyProperty.OverrideMetadata(typeof(TitleTextBox), new FrameworkPropertyMetadata(typeof(TitleTextBox)));

            TitleProperty = DependencyProperty.Register("Title", typeof(string), typeof(TitleTextBox), new UIPropertyMetadata(new PropertyChangedCallback(TitlePropertyChangedCallback)));

        }

        private static void TitlePropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)

        {

            TitleTextBox ttb = d as TitleTextBox;

            if (ttb._tbkTitle != null)

            {

                ttb._tbkTitle.Text = (string)e.NewValue;

            }

        }

        public override void OnApplyTemplate()

        {

            base.OnApplyTemplate();

            _tbkTitle = Template.FindName(TitleTextBlockKey, this) as TextBlock;

            _tbkTitle.Text = Title;

        }

    }

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

                    xmlns:local="clr-namespace:WPFTitleTextBox.Resources.Styles"

                    xmlns:uc="clr-namespace:WPFTitleTextBox">

    <Style TargetType="{x:Type uc:TitleTextBox}">

        <Setter Property="SnapsToDevicePixels" Value="True"/>

        <Setter Property="FontSize" Value="12"/>

        <Setter Property="Height" Value="28"/>

        <Setter Property="UndoLimit" Value="0"/>

        <Setter Property="Template">

            <Setter.Value>

                <ControlTemplate TargetType="{x:Type uc:TitleTextBox}">

                    <Border x:Name="OuterBorder" BorderBrush="#8b99bc" BorderThickness="1" CornerRadius="1" Background="#f7f7f7">

                        <Grid>

                            <Grid.ColumnDefinitions>

                                <ColumnDefinition Width="Auto"/>

                                <ColumnDefinition Width="Auto"/>

                                <ColumnDefinition Width="*"/>

                            </Grid.ColumnDefinitions>

                            <TextBlock x:Name="PART_TitleTextBlock" Text="{Binding Title}" Foreground="#a7abb0" VerticalAlignment="Center" Margin="5,0"/>

                            <Line Grid.Column="1" Stroke="#ccd1d7" StrokeDashArray="2,2" StrokeThickness="1.5" X1="0" Y1="0"

                                  X2="0" Y2="{TemplateBinding Height}" Margin="0,4"/>

                            <Border Grid.Column="2" Background="White">

                                <ScrollViewer x:Name="PART_ContentHost" Margin="5,0" VerticalAlignment="Center" FontSize="14"/>

                            </Border>

                        </Grid>

                    </Border>

                </ControlTemplate>

            </Setter.Value>

        </Setter>

    </Style>

</ResourceDictionary>

    <Grid>

        <StackPanel>

            <local:TitleTextBox Title="姓名" Width="270" Margin="5,10"/>

            <local:TitleTextBox Title="班级" Width="270"/>

            <local:TitleTextBox Title="专业" Width="270" Margin="5,10"/>

        </StackPanel>

    </Grid>