Linqpad multiline textbox dialog

TextboxDialog.linq

// TextboxDialog for LINQPad
// You can use it anywhere by adding the following code to MyExtensions class on Linqpad6. 
// Usage:
// var lines = MyExtensions.ReadLines()
// foreach (var line in lines)
//	Console.WriteLine(line);

public static class MyExtensions
{
	// Write custom extension methods here. They will be available to all queries.
	public static IEnumerable<string> ReadLines(string title = null)
	{
		var win = new System.Windows.Window() { Width = 400, Height = 300, Title = title ?? string.Empty };
		var grid = new System.Windows.Controls.Grid();
		grid.RowDefinitions.Add(new System.Windows.Controls.RowDefinition() { Height = new System.Windows.GridLength(1, System.Windows.GridUnitType.Star) });
		grid.RowDefinitions.Add(new System.Windows.Controls.RowDefinition() { Height = new System.Windows.GridLength(36) });
		var margin3 = new System.Windows.Thickness(3);
		var tbox = new System.Windows.Controls.TextBox()
		{
			Margin = margin3,
			AcceptsReturn = true,
			AcceptsTab = true,
			VerticalScrollBarVisibility = System.Windows.Controls.ScrollBarVisibility.Auto,
			HorizontalScrollBarVisibility = System.Windows.Controls.ScrollBarVisibility.Auto,
		};
		var btnOk = new System.Windows.Controls.Button() { Content = "OK", Margin = margin3, Width = 80 };
		var btnCancel = new System.Windows.Controls.Button() { Content = "Cancel", Margin = margin3, Width = 80 };
		btnOk.Click += (_, _) => { win.DialogResult = true; win.Close(); };
		btnCancel.Click += (_, _) => { win.DialogResult = false; win.Close(); };
		var sp = new System.Windows.Controls.StackPanel()
		{
			Orientation = System.Windows.Controls.Orientation.Horizontal,
			HorizontalAlignment = System.Windows.HorizontalAlignment.Right,
		};
		sp.Children.Add(btnOk);
		sp.Children.Add(btnCancel);
		System.Windows.Controls.Grid.SetRow(tbox, 0);
		System.Windows.Controls.Grid.SetRow(sp, 1);
		grid.Children.Add(tbox);
		grid.Children.Add(sp);
		win.Content = grid;
		return win.ShowDialog() == true ? tbox.Text.Split("\r\n") :  new string[0];
	}
}