Изменять расположение Grid в соответствии с изменением размеров окна

[REztor]

Всем привет.
Как можно изменить расположение Grid, при изменении размеров окна?

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;
using Microsoft.Win32;
 
namespace WpfApplication2
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            double x = main_grid.ActualWidth;
        }
 
        ThicknessAnimation ta = new ThicknessAnimation();
        Grid grid_darkviolet = new Grid();
        bool fl = true;
        //double width = System.Windows.SystemParameters.MaximumWindowTrackWidth;
             
        public double mwidth { get { return main_grid.ActualWidth; } }
        
        private void Grid_Move(object sender, RoutedEventArgs e)
        {
            grid_green.Margin = new Thickness(0, 0, 0, 0);
            ta.From = grid_green.Margin;
            ta.To = new Thickness(0, 0, mwidth, 0);
            ta.Duration = TimeSpan.FromSeconds(0.5);
            grid_green.BeginAnimation(MarginProperty, ta);
            
            grid_darkviolet.Height = 200;
            grid_darkviolet.Width = 350;
            grid_darkviolet.Background = Brushes.DarkViolet;
            grid_darkviolet.Margin = new Thickness(mwidth, 0, 0, 0);
 
            Button bt = new Button();
            bt.Content = "<";
            bt.Height = 50;
            bt.Width = 50;
            bt.Margin = new Thickness(200, 100, 0, 0);
            bt.Click += new RoutedEventHandler(Grid_Move_Back);
 
            if (fl == true)
            {
               grid_darkviolet.Children.Add(bt);
               main_grid.Children.Add(grid_darkviolet);
               fl = false;
            }
 
            ta.From = grid_darkviolet.Margin;
            ta.To = new Thickness(0, 0, 0, 0);
            ta.Duration = TimeSpan.FromSeconds(0.5);
            grid_darkviolet.BeginAnimation(MarginProperty, ta);
        }
 
        private void Grid_Move_Back(object sender, RoutedEventArgs e)
        {
            ta.From = grid_darkviolet.Margin;
            ta.To = new Thickness(mwidth, 0, 0, 0);
            ta.Duration = TimeSpan.FromSeconds(0.5);
            grid_darkviolet.BeginAnimation(MarginProperty, ta);
 
            ta.From = grid_green.Margin;
            ta.To = new Thickness(0, 0, 0, 0);
            ta.Duration = TimeSpan.FromSeconds(0.5);
            grid_green.BeginAnimation(MarginProperty, ta);
        }
    }
}

<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_grid">
        <Grid x:Name="grid_green"  Height="200" Width="350" Background="Green">
            <Button Name="bt_green" Width="50" Height="50" Margin="200,100,0,0" Content=">" Click="Grid_Move"></Button>
        </Grid>
    </Grid>
</Window>

[Alex11223]

Не задавать размер жестко через width/height, и все будет само.