Containers Silverlight

    xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' 
    xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
    xmlns:d='http://schemas.microsoft.com/expression/blend/2008' 
    xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' 
    mc:Ignorable='d' 
    d:DesignWidth='640' 
    d:DesignHeight='480'>
  
    
      A Button Stack
    
    Button 1
    Button 2
    Button 3
    Button 4
         Checked="chkVertical_Checked" Unchecked="chkVertical_Unchecked">
      Use Vertical Orientation            
  

//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
namespace SilverlightApplication3
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }
        private void chkVertical_Checked(object sender, RoutedEventArgs e)
        {
            stackPanel1.Orientation = Orientation.Horizontal;
        }
        private void chkVertical_Unchecked(object sender, RoutedEventArgs e)
        {
            stackPanel1.Orientation = Orientation.Vertical;
        }
    }
}