C# / .NET / WPF / code to attach to WindowOpenedEvent and maximize new windows

MainWindow.xaml.cs

using System;
using System.Diagnostics;
using System.Linq;
using System.Windows;
using System.Windows.Automation;

namespace AutoMaximize
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            Automation.AddAutomationEventHandler(
                WindowPattern.WindowOpenedEvent,
                AutomationElement.RootElement,
                TreeScope.Children ,
                (sender, e) =>
                {
                    var element = sender as AutomationElement;

                    if (element != null)
                    {
                        Trace.WriteLine($"{element.Current.Name} ({element.Current.LocalizedControlType})");

                        try
                        {
                            if (new[] { "window", "pane" }.Contains(element.Current.LocalizedControlType))
                            {
                                System.Threading.Thread.Sleep(1000);
                                var windowPattern = element.GetCurrentPattern(WindowPattern.Pattern) as WindowPattern;
                                if (windowPattern != null && windowPattern.Current.CanMaximize && !windowPattern.Current.IsModal)
                                {
                                    windowPattern.SetWindowVisualState(WindowVisualState.Maximized);
                                }
                            }
                        }
                        catch (Exception ex)
                        {
                            Trace.WriteLine(ex.Message);
                        }
                    }
                });

            InitializeComponent();

            //Automation.RemoveAllEventHandlers();
        }
    }
}