InputBox WPF C#

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// --------------------------------------------------------------------------------------------------------------------
// <info file="CsharpInputBox.cs" author="Rouven Himmelstein" version="1.2.0.0" releaseDate="21.05.2012">
//   (c) by Rouven Himmelstein
// </info>
// --------------------------------------------------------------------------------------------------------------------
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

/// <summary>
/// Shows a InputBox dialog.
/// </summary>
static class InputBox
{
    static Window dialogWindow;
    static InputBoxResult PressedButton;

    private enum InputBoxResult
    {
        Ok = 0,
        Cancel = 1,
        Default = 2,
    }

    /// <summary>
    /// Shows the InputBox.
    /// </summary>
    /// <param name="caption">Caption of the window.</param>
    /// <param name="description">Description of the window.</param>
    /// <param name="defaultInputValue">Default value of the InputBox.</param>
    /// <returns></returns>
    public static string ShowDialog(string caption, string description, string defaultInputValue)
    {
        var rootPanel = new StackPanel { Margin = new Thickness(5) };
        var AA = new StackPanel { Orientation = Orientation.Horizontal };
        var AB = new StackPanel { };

        rootPanel.Children.Add(AA);
        rootPanel.Children.Add(AB);

        var AAA = new StackPanel { Width = 215, Margin=new Thickness(2.5) };
        var AAB = new StackPanel { Width = 75, Orientation = Orientation.Vertical };

        AA.Children.Add(AAA);
        AA.Children.Add(AAB);

        dialogWindow = new Window
        {
            Title = caption,
            WindowStartupLocation = WindowStartupLocation.CenterOwner,
            WindowStyle = WindowStyle.ThreeDBorderWindow,
            ResizeMode = ResizeMode.NoResize,
            Width = 315,
            Height = 120,
            Content = rootPanel,
            ShowInTaskbar = false,
            Background = Brushes.LightGray
        };

        var descriptionText = new TextBlock { Text = description, TextWrapping = TextWrapping.Wrap, MaxHeight = 50 };
        var inputTextBox = new TextBox { Text = defaultInputValue };
        var OkButton = new Button { Content = "Ok", Margin = new Thickness(0, 0, 0, 5) };
        var CancelButton = new Button { Content = "Abbrechen", Margin = new Thickness(0, 0, 0, 5) };

        OkButton.Click += new RoutedEventHandler(OkButton_Click);
        CancelButton.Click += new RoutedEventHandler(CancelButton_Click);
        dialogWindow.KeyDown += new System.Windows.Input.KeyEventHandler(dialogWindow_KeyDown);

        AAA.Children.Add(descriptionText);
        AB.Children.Add(inputTextBox);
        AAB.Children.Add(OkButton);
        AAB.Children.Add(CancelButton);

        PressedButton = InputBoxResult.Default;

        inputTextBox.Focus();
        inputTextBox.SelectAll();

        dialogWindow.ShowDialog();

        switch (PressedButton)
        {
            case InputBoxResult.Ok:
                return inputTextBox.Text;
            case InputBoxResult.Cancel:
                return string.Empty;
            default:
                return string.Empty;
        }
    }
    private static void OkButton_Click(object sender, RoutedEventArgs e)
    {
        PressedButton = InputBoxResult.Ok;
        dialogWindow.Close();
    }

    private static void CancelButton_Click(object sender, RoutedEventArgs e)
    {
        PressedButton = InputBoxResult.Cancel;
        dialogWindow.Close();
    }

    private static void dialogWindow_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
    {
        switch (e.Key)
        {
            case System.Windows.Input.Key.Enter:
                PressedButton = InputBoxResult.Ok;
                dialogWindow.Close();
                break;
            case System.Windows.Input.Key.Escape:
                PressedButton = InputBoxResult.Cancel;
                dialogWindow.Close();
                break;
        }
    }
}