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    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="450" Width="300">
    
        
            
                
                    
                                                            CurrentTimeInvalidated="Storyboard_Changed">
                                                             Storyboard.TargetName="meMediaElement"
                                 RepeatBehavior="Forever" />
                        
                    
                
            
            
                
                    
                
            
            
                
                    
                
            
            
                
                    
                
            
                                          SourceName="sldPosition" >
                
            
                                          SourceName="sldPosition" >
                
            
        
                              Margin="5" MinHeight="300" Stretch="Fill"
                      MediaOpened="MediaOpened" />
        
        
        
        
                        Name="sldPosition" Width="250"
                ValueChanged="sldPosition_ValueChanged">
        
        
        
        
        
    

//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        bool ignoreValueChanged = false;
        public Window1()
        {
            InitializeComponent();
        }
        private void MediaOpened(object sender, EventArgs e)
        {
            sldPosition.Maximum = meMediaElement.NaturalDuration.TimeSpan.TotalMilliseconds;
        }
        private void Storyboard_Changed(object sender, EventArgs e)
        {
            ClockGroup clockGroup = sender as ClockGroup;
            MediaClock mediaClock = clockGroup.Children[0] as MediaClock;
            if (mediaClock.CurrentProgress.HasValue){
                ignoreValueChanged = true;
                sldPosition.Value = meMediaElement.Position.TotalMilliseconds;
                ignoreValueChanged = false;
            }
        }
        private void sldPosition_ValueChanged(object sender, RoutedPropertyChangedEventArgs e){
            if (ignoreValueChanged)
            {
                return;
            }
            Storyboard.Seek(Panel,TimeSpan.FromMilliseconds(sldPosition.Value),TimeSeekOrigin.BeginTime);
        }
    }
}