Untitled

using System.Windows;
using System.Windows.Input;

namespace WinFormWPFTest
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        System.Windows.Forms.PictureBox pictureBox;
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Grid_Loaded(object sender, RoutedEventArgs e)
        {
            System.Windows.Forms.Integration.WindowsFormsHost host = new System.Windows.Forms.Integration.WindowsFormsHost();
            pictureBox = new System.Windows.Forms.PictureBox();
            pictureBox.Anchor = System.Windows.Forms.AnchorStyles.Top;
            pictureBox.Paint += new System.Windows.Forms.PaintEventHandler(pictureBox_Paint);
            host.Child = pictureBox;
            this.grid1.Children.Add(host);
        }

        private void pictureBox_Paint(object sender, System.Windows.Forms.PaintEventArgs args)
        {
            ;
        }

        private void grid1_MouseDown(object sender, MouseButtonEventArgs e)
        {
            pictureBox.Invalidate();
        }
    }
}