In the following WPF app, I have an Image in a ContentControl. When the user clicks on the image, how can I get the x/y coordinates of where the mouse clicked on the image?

XAML:

<Window x:Class="TestClick828374.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <StackPanel Margin="10">
        <ContentControl Content="{Binding TheImage}" MouseDown="ContentControl_MouseDown"/>
    </StackPanel>
</Window>

Code-Behind:

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.ComponentModel;

namespace TestClick828374
{
    public partial class Window1 : Window, INotifyPropertyChanged
    {
        #region ViewModelProperty: TheImage
        private Image _theImage;
        public Image TheImage
        {
            get
            {
                return _theImage;
            }

            set
            {
                _theImage = value;
                OnPropertyChanged("TheImage");
            }
        }
        #endregion

        public Window1()
        {
            InitializeComponent();
            DataContext = this;

            TheImage = new Image();
            TheImage.Source = new BitmapImage(new Uri(@"c:\test\rectangle.png"));
            TheImage.Stretch = Stretch.None;
            TheImage.HorizontalAlignment = HorizontalAlignment.Left;

        }

        #region INotifiedProperty Block
        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;

            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
        #endregion

        private void ContentControl_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            //how to get the coordinates of the mouse click here on the image?
        }

    }
}