Одинаковая скорость при выполнении анимации

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Всем привет.
Можете подсказать, как сделать чтобы скорость объектов при выполнении анимации была одинаковой?

Код: Выделить всё

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Data; 
using System.Windows.Documents; 
using System.Windows.Input; 
using System.Windows.Media; 
using System.Windows.Media.Animation; 
using System.Windows.Media.Imaging; 
using System.Windows.Navigation; 
using System.Windows.Shapes; 
  
namespace WpfApplication2 
{ 
    /// <summary> 
    /// Interaction logic for MainWindow.xaml 
    /// </summary> 
    public partial class MainWindow : Window 
    { 
        public MainWindow() 
        { 
            InitializeComponent(); 
            ta.Completed += ComplitedAnimation; 
  
            ta.FillBehavior = FillBehavior.Stop; 
            ta.Duration = TimeSpan.FromSeconds(0.5); 
            ta.Duration = new Duration(new TimeSpan(0, 0, 5)); 
        } 
  
        ThicknessAnimation ta = new ThicknessAnimation(); 
  
        public double main_window_width { get { return main_window_grid.ActualWidth; } } 
        public bool fl1; 
        public bool fl2; 
        private Thickness marginBackup; 
  
        private void ComplitedAnimation(object sender, EventArgs e) 
        {            
            if (fl1 == true) 
            { 
                fl1 = false; 
                grid_blue.Visibility = Visibility.Visible; 
                grid_red.Margin = marginBackup; 
            } 
  
            if (fl2 == true) 
            { 
                fl2 = false; 
                grid_red.Visibility = Visibility.Collapsed; 
                grid_blue.Margin = marginBackup; 
            } 
  
        } 
  
        private void Move_Animation(object sender, RoutedEventArgs e) 
        { 
            fl1 = true; 
            ta.From = new Thickness(main_window_width, 0, 0, 0); 
            ta.To =  grid_red.Margin; 
            marginBackup =  grid_red.Margin; 
           
            grid_red.BeginAnimation(MarginProperty, ta); 
            grid_red.Visibility = Visibility.Visible; 
  
            ta.From = grid_blue.Margin; 
            ta.To = new Thickness(0, 0, main_window_width, 0); 
            grid_blue.BeginAnimation(MarginProperty, ta); 
        } 
    } 
}

Код: Выделить всё

<Window x:Class="WpfApplication2.MainWindow" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        Title="MainWindow" Height="350" Width="525"> 
    <Grid x:Name="main_window_grid"> 
        <Grid> 
            <Grid x:Name="grid_blue"  Height="200" Width="350" Background="Blue" Margin="0,0,0,0"> 
            <Button Name="bt_blue" Width="50" Height="50" Margin="200,100,0,0" Content="button" Click="Move_Animation"></Button> 
        </Grid> 
        <Grid x:Name="grid_red"  Height="200" Width="350" Background="red" Margin="0,0,0,0" Visibility="Collapsed"> 
                <Button Name="bt_red" Width="50" Height="50" Margin="200,100,0,0" Content="button"></Button> 
        </Grid> 
        </Grid> 
    </Grid> 
</Window>