WPF(C#) ウィンドウ内のコントロールの値を操作し、別ウィンドウへ動的に反映させたい

<Window x:Class="BindingWindow.SliderWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:BindingWindow"
        mc:Ignorable="d"
        Title="SliderWindow" Height="450" Width="800">
    <Grid>
        <StackPanel VerticalAlignment="Center">
            <Slider x:Name="sliderX"
                    Minimum="10"
                    Maximum="1000"
                    Margin="20"
                    Value="{Binding Width, Mode=TwoWay}" />
            <Slider x:Name="sliderY"
                    Minimum="10"
                    Maximum="1000"
                    Margin="20"
                    Value="{Binding Height, Mode=TwoWay}" />
        </StackPanel>
    </Grid>
</Window>

    /// <summary>
    /// MainWindow.xaml の相互作用ロジック
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        protected override void OnContentRendered(EventArgs e)
        {
            base.OnContentRendered(e);
            new SliderWindow()
            {
                DataContext = this
            }.Show();
        }
    }

<Window x:Class="WindowSizeSlider.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WindowSizeSlider"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800" Loaded="Window_Loaded">
    <Grid>
    </Grid>
</Window>

    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            SubWindow subWindow = new SubWindow();
            subWindow.Owner = this;
            subWindow.Show();
        }
    }

<Window x:Class="WindowSizeSlider.SubWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WindowSizeSlider"
        mc:Ignorable="d"
        Title="SubWindow" Height="450" Width="800">
    <StackPanel VerticalAlignment="Center">
        <Slider x:Name="sliderX" Minimum="10" Maximum="1000" Margin="20" ValueChanged="SliderX_ValueChanged"/>
        <Slider x:Name="sliderY" Minimum="10" Maximum="1000" Margin="20" ValueChanged="SliderY_ValueChanged"/>
    </StackPanel>
</Window>

    public partial class SubWindow : Window
    {
        public SubWindow()
        {
            InitializeComponent();
        }

        private void SliderX_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        {
            if (this.Owner != null)
            {
                this.Owner.Width = e.NewValue;
            }
        }

        private void SliderY_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        {
            if (this.Owner != null)
            {
                this.Owner.Height = e.NewValue;
            }
        }
    }