How to get parent control in wpf?

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C#

WPF

Use MessageBox to display a dialog box that appears in the caller's central, obviously, to do this, MessageBox must get the parent control, so as to calculate the center position.

I have a similar problem in a page where clicking the button displays a popup, and set the page's property IsEnable to false, therefore, code must get the parent control --- page, but I do not know can not do so.

example:

namespace WpfBrowserApplication1
{
    /// <summary>
    /// Interaction logic for Page1.xaml
    /// </summary>
    public partial class Page1 : Page
    {
        public Page1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            MessagePopup.Show(this,"hello");
        }
    }
}

namespace WpfBrowserApplication1
{
    public sealed class MessagePopup
    {
        public static void Show(UIElement parent, string message)
        {
            Popup window = new Popup();
            StackPanel sp = new StackPanel { Margin = new Thickness(5) };
            sp.Children.Add(new TextBlock { Text = message });
            Button newButton = new Button { Content = "button" };
            newButton.Click += delegate { window.IsOpen = false; parent.IsEnabled = true; };
            sp.Children.Add(newButton);
            sp.Children.Add(new Slider { Minimum = 0, Maximum = 50, Value = 25, Width = 100 });
            window.Child = new Border
            {
                Background = Brushes.White,
                BorderBrush = Brushes.Black,
                BorderThickness = new Thickness(2),
                Child = sp
            };
            window.PlacementTarget = parent;
            window.Placement = PlacementMode.Center;
            window.IsOpen = true;
            parent.IsEnabled = false;
        }
    }
}

I hope that the parent is get by code , not by parameters,like this:

public static void Show(string mess)
{
    UIElement parent = //get the parent control --- page
    ...
    parent.IsEnable = false;
}

Thanks.