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    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="Viewbox_Stretch_Layout_Samp.Window1"
    Title="ViewBox Stretch and StretchDirection Sample">
  
        
            Stretch="None"
            Stretch="Fill"
            Stretch="Uniform"
            Stretch="UniformToFill"
            StretchDirection="UpOnly"
            StretchDirection="DownOnly"
            StretchDirection="Both"
                 
        
        
        
        
        
            
                
                
        
  

//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
namespace Viewbox_Stretch_Layout_Samp
{
  public partial class Window1 : Window
  {
        public void stretchNone(object sender, RoutedEventArgs e)
        {
            vb1.Stretch = System.Windows.Media.Stretch.None;
            txt1.Text = "Stretch is now set to None.";
        }
        public void stretchFill(object sender, RoutedEventArgs e)
        {
            vb1.Stretch = System.Windows.Media.Stretch.Fill;
            txt1.Text = "Stretch is now set to Fill.";
        }
        public void stretchUni(object sender, RoutedEventArgs e)
        {
            vb1.Stretch = System.Windows.Media.Stretch.Uniform;
            txt1.Text = "Stretch is now set to Uniform.";
        }
        public void stretchUniFill(object sender, RoutedEventArgs e)
        {
            vb1.Stretch = System.Windows.Media.Stretch.UniformToFill;
            txt1.Text = "Stretch is now set to UniformToFill.";
        }
        public void sdUpOnly(object sender, RoutedEventArgs e)
        {
            vb1.StretchDirection = System.Windows.Controls.StretchDirection.UpOnly;
            txt2.Text = "StretchDirection is now UpOnly.";
        }
        public void sdDownOnly(object sender, RoutedEventArgs e)
        {
            vb1.StretchDirection = System.Windows.Controls.StretchDirection.DownOnly;
            txt2.Text = "StretchDirection is now DownOnly.";
        }
        public void sdBoth(object sender, RoutedEventArgs e)
        {
            vb1.StretchDirection = System.Windows.Controls.StretchDirection.Both;
            txt2.Text = "StretchDirection is now Both.";
        }
    }
}