How to host PDFviewer WPF in windows forms application

   // Declare the ElementHost variable

        ElementHost elementHost = null;

   // Wire up the Load event

            this.Load += new System.EventHandler(this.Form1_Load);

private void Form1_Load(object sender, System.EventArgs e)

        {

            // Create the ElementHost control

            elementHost = new ElementHost();

            elementHost.AutoSize = true;

            elementHost.Size = panel1.Size;

            elementHost.Dock = DockStyle.Fill;

            panel1.Controls.Add(elementHost);

            PdfViewer wordEditor = new PdfViewer();

            elementHost.Child = wordEditor;

            elementHost.Margin = new Padding(0, 0, 0, 0);

            elementHost.Region = new Region();

            elementHost.BackColor = System.Drawing.Color.White;

        }