How to print same control in multiple pages

/// <summary>
/// Print the current view to PDF or printer
/// </summary>
/// <param name="sender"></param>
/// <param name="re"></param>
private void Print_Click(object sender, RoutedEventArgs re)
{

    const double CMTOPIXEL = 37.79527559055;
    // size expected = 18 cm * 10.3 cm
    Size ExpectedSize = new Size(18 * CMTOPIXEL, 10.3 * CMTOPIXEL);

    System.Windows.FrameworkElement e = printPanel as System.Windows.FrameworkElement;
    if (e == null)
        return;
    // if all ECU doesn't contains something => not print
    if (affectedPinByECU.Count == 0)
        return;

    // select printer and get printer settings
    PrintDialog pd = new PrintDialog();
    pd.SelectedPagesEnabled = true;
    pd.PageRangeSelection = PageRangeSelection.SelectedPages;

    // if windows is close without print
    if (pd.ShowDialog() != true) return;

    List<int> toPrint = new List<int>();
    if (pd.PageRangeSelection == PageRangeSelection.AllPages)
    {
        for (int i = 0; i < MaxNumberOfECU; i++)
            toPrint.Add(i);
    }
    else
    {
        foreach (var usedpage in affectedPinByECU)
        {
            toPrint.Add(usedpage.Key);
        }
    }
    // create a document
    FixedDocument document = new FixedDocument();
    document.DocumentPaginator.PageSize = new Size(pd.PrintableAreaWidth, pd.PrintableAreaHeight);
    PrintCapabilities capabilities = pd.PrintQueue.GetPrintCapabilities(pd.PrintTicket);
    Thickness margin = new Thickness(10);

    double scalex = ExpectedSize.Width / e.ActualWidth;
    double scaley = ExpectedSize.Height / e.ActualHeight;

    e.RenderTransform = new ScaleTransform(scalex, scaley);

    Size visibleSize = new Size(capabilities.PageImageableArea.ExtentWidth - margin.Left - margin.Right, capabilities.PageImageableArea.ExtentHeight - margin.Top - margin.Bottom);

    //update the layout of the visual to the printer page size.
    e.Measure(visibleSize);
    e.Arrange(new Rect(visibleSize));
                   e.UpdateLayout();

    // for each page to pring
    foreach (var usedpage in toPrint)
    {
        FixedPage page1 = new FixedPage();
        page1.Width = document.DocumentPaginator.PageSize.Width;
        page1.Height = document.DocumentPaginator.PageSize.Height;

        Canvas canvas = UpdateECUpages(e, usedpage, visibleSize, capabilities.PageImageableArea, margin);

        page1.Children.Add(canvas);

        PageContent page1Content = new PageContent();
        ((IAddChild)page1Content).AddChild(page1);

        document.Pages.Add(page1Content);
    }

    // go back to the current ecu;

    vUpdateECU(indexECU);
    // and print
    pd.PrintDocument(document.DocumentPaginator, "My first document");

    e.RenderTransform = new ScaleTransform(1, 1);
}

private Canvas UpdateECUpages(FrameworkElement e, int i, Size visibleSize, PageImageableArea PageImageableArea, Thickness margin)
{

    vUpdateECU(i);

    // clone the element
    Canvas newCanvas = new Canvas();
    DockPanel dk = new DockPanel();

    // Add text at the begin
    TextBlock page1Text = new TextBlock();
    if (i == 0)
        page1Text.Text = "Master";
    else
        page1Text.Text = "Slave " + i;
    page1Text.FontSize = 40;
    page1Text.Margin = new Thickness(10);
    page1Text.HorizontalAlignment = HorizontalAlignment.Center;
    DockPanel.SetDock(page1Text, Dock.Top);
    dk.Children.Add(page1Text);

    newCanvas.Children.Add(dk);

    e.UpdateLayout();
    VisualBrush vb = new VisualBrush(e);


    vb.Stretch = Stretch.None;
    vb.AlignmentX = AlignmentX.Center;
    vb.AlignmentY = AlignmentY.Top;
    vb.ViewboxUnits = BrushMappingMode.Absolute;
    vb.TileMode = TileMode.None;
    vb.Viewbox = new Rect(0, 0, visibleSize.Width, visibleSize.Height);

    FixedPage.SetLeft(newCanvas, PageImageableArea.OriginWidth);
    FixedPage.SetTop(newCanvas, PageImageableArea.OriginHeight);

    newCanvas.Width = visibleSize.Width;
    newCanvas.Height = visibleSize.Height;
    newCanvas.Background = vb;
    newCanvas.Margin = margin;
    return newCanvas;
}