Shared Dependency Property in WPF

<Window x:Class="WpfApplication16.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:dc="clr-namespace:WpfApplication16"
    Title="Window1" Height="300" Width="300">
    <Window.Resources>
        <Style x:Key="TestStyle">
            <Setter Property="dc:T1.IntTest" Value="5"/>
            <Setter Property="dc:T2.IntTest" Value="10"/>
        </Style>
    </Window.Resources>
    <StackPanel>
    <StackPanel Background="green" Margin="0,0,0,10">
            <dc:T1 x:Name="t1" IntTest="5" Text="T1 = 5" Background="red"/>
            <dc:T2 x:Name="t2" IntTest="10" Text="T2 = 10" Background="red"/>
        <TextBlock Text="{Binding ElementName=t1, Path=IntTest}"></TextBlock>
        <TextBlock Text="{Binding ElementName=t2, Path=IntTest}"></TextBlock>
    </StackPanel>

        <StackPanel Background="Yellow">
            <dc:T1 x:Name="tt1" Style="{StaticResource TestStyle}" Background="red" Text="T1 = TestStyle"/>
            <dc:T2 x:Name="tt2" Style="{StaticResource TestStyle}" Background="red" Text="T2 = TestStyle"/>
            <TextBlock Text="{Binding ElementName=tt1, Path=IntTest}"></TextBlock>
            <TextBlock Text="{Binding ElementName=tt2, Path=IntTest}"></TextBlock>
        </StackPanel>
    </StackPanel>
</Window>

namespace WpfApplication16
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
    }





    public class T1 : TextBlock
    {


        // Definition of Dependency property
        public static readonly DependencyProperty IntTestProperty = DependencyProperty.Register("IntTest", typeof(int), typeof(T1));

        public int IntTest
        {
            get { return (int)GetValue(IntTestProperty); }
            set { SetValue(IntTestProperty, value); }
        }
    }

    // definition of class which uses the dependency property defined above
    public class T2 : TextBlock
    {
        public static readonly DependencyProperty IntTestProperty = T1.IntTestProperty.AddOwner(typeof(T2));
        public int IntTest
        {
            get { return (int)GetValue(IntTestProperty); }
            set { SetValue(IntTestProperty, value); }
        }


    }


}