WPF自定义控件不显示数据

这里有我的自定义控件:

<UserControl x:Class="Tasks.Assets.Objects.Card"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         xmlns:local="clr-namespace:Tasks.Assets.Objects"
         mc:Ignorable="d" 
         d:DesignHeight="200" d:DesignWidth="150">
<Grid>

    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="10"/>
        <ColumnDefinition Width="1*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height="135"/>
        <RowDefinition Height="5"/>
        <RowDefinition Height="30"/>
        <RowDefinition Height="30"/>
    </Grid.RowDefinitions>

    <Rectangle Fill="{DynamicResource MutedWhite}" Grid.RowSpan="4" Grid.ColumnSpan="2"/>
    <TextBlock x:Name="textBlock" Grid.Column="1" Text="{Binding Path=Title}"  TextWrapping="Wrap" FontFamily="/Tasks;component/Assets/Fonts/#Abel" FontSize="24"/>
    <Rectangle Fill="{DynamicResource MutedGrey}" Grid.Row="1" Grid.ColumnSpan="2"/>

</Grid>

C#代码隐藏:

public partial class Card : UserControl
{
    public Card()
    {
        InitializeComponent();
    }

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

        set { SetValue(TitleProperty, value); }
    }

    public static readonly DependencyProperty TitleProperty =

      DependencyProperty.Register("Title", typeof(string), typeof(Card), new UIPropertyMetadata(""));

}

在MainWindow.xaml上

<Objects:Card Grid.Column="1" Grid.Row="1" Title="Say Something Here"/>

我通过添加没有绑定的文本来测试这一点,效果很好。然而,问题在于绑定。我希望能够通过使用xaml标记在主窗口上设置文本对象,但我无法做到这一点,因为它不会显示给我。非常感谢您的帮助:)