Добавление progressbar в SplashScreen

public static readonly DependencyProperty ProgressBar_ValueChanged =
            DependencyProperty.Register("ProgressBar_ValueChanged", typeof(float), typeof(SplashScreen),new UIPropertyMetadata(null));

public static readonly DependencyProperty Progress_Bar_Property =
            DependencyProperty.Register("Progress_Bar_Property", typeof(ProgressBar), typeof(SplashScreen),
                                        new UIPropertyMetadata(null, On_Progress_Bar_Changed));
 
        public ProgressBar Progress_Bar
        {
            get { return (ProgressBar)this.GetValue(Progress_Bar_Property); }
            set { this.SetValue(Progress_Bar_Property, value); }
        }
 
        public event EventHandler Progress_Bar_Change;
 
        private void Progress_Bar_Chanded(EventArgs e)
        {
            EventHandler handler = this.Progress_Bar_Change;
            if (handler != null) handler(this, e);
        }
 
        private static void On_Progress_Bar_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            SplashScreen splashScreen = (SplashScreen)d;
            splashScreen.Progress_Bar_Chanded(EventArgs.Empty);
        }

splashScreen.Dispatcher.BeginInvoke((Action)(() => splashScreen.Progress_Bar.Value = 50));