App.xaml.cs :  » Windows-Presentation-Foundation » Snoop » InvisibleOwnerWindowIssue » C# / CSharp Open Source

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Windows;
using System.Windows.Shapes;
using System.Windows.Media;

namespace InvisibleOwnerWindowIssue{
  /// <summary>
  /// Interaction logic for App.xaml
  /// </summary>
  public partial class App : Application
  {
    private Window _hiddenWindow;
    private Window _shownWindow;

    protected override void OnStartup(StartupEventArgs args)
    {
      base.OnStartup(args);

      _hiddenWindow = new Window();
      _hiddenWindow.Title = "Hidden";

      _shownWindow = new Window();
      _shownWindow.Width = 300;
      _shownWindow.Height = 300;
      _shownWindow.Title = "Shown";
      Rectangle rectangle = new Rectangle();
      rectangle.Width = 200;
      rectangle.Height = 50;
      rectangle.HorizontalAlignment = HorizontalAlignment.Center;
      rectangle.VerticalAlignment = VerticalAlignment.Center;
      rectangle.Fill = new SolidColorBrush(Colors.DarkRed);
      _shownWindow.Content = rectangle;
      _shownWindow.Closing += (sender, e) =>
      {
        _hiddenWindow.Close();
      };
      _shownWindow.Show();
    }
  }
}