WPF C# Tutorial

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Owner" Height="300" Width="300"
    >
  Create Owned Window

//File:Window.xaml.cs
using System;
using System.Collections.Generic;
using System.Text;
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.Imaging;
using System.Windows.Shapes;
namespace Windows
{
    public partial class WindowOwnership : System.Windows.Window
    {
        public WindowOwnership()
        {
            InitializeComponent();
        }
        private void cmdCreate_Click(object sender, RoutedEventArgs e)
        {
            WindowOwnership win = new WindowOwnership();
            win.Owner = this;
            win.Title = "Owned Window";
            win.Height = this.Height/2;
            win.Width = this.Width/2;
            win.WindowStartupLocation = WindowStartupLocation.CenterOwner;
            win.Show();
        }
    }
}