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        private void button1_Click(object sender, RoutedEventArgs e)
        {

            fill50Rects();
      
            DocumentViewer docView1 = new DocumentViewer();
            try
            {
                grid1.Children.Remove(docView1);
            }
            catch (Exception) { }
            PageContent pc = new PageContent(); 
            FixedPage fp = new FixedPage();

            // --- Wichtiger Teil ------------------------------------------
            Canvas c1 = new Canvas();
            for (int i = 0; i < LRec.Count; i++)
            {
                c1.Children.Add(LRec[i]);  
            }
            fp.Children.Add(c1);[/b]
            // -------------------------------------------------------------
            ((IAddChild)pc).AddChild(fp);
            FixedDocument fixDoc1 = new FixedDocument();
            fixDoc1.Pages.Add(pc);
            ((IAddChild)docView1).AddChild(fixDoc1);
            grid1.Children.Add(docView1);
  }
  
        List<Rectangle> LRec = new List<Rectangle>();
        List<Canvas> LCan = new List<Canvas>();
  //Fülle LRec und LCan
        private void fill50Rects()
        {
            //Rectangles
            for (int i = 0; i < 50; i++)
            {
                Random rand = new Random(3);
                Rectangle tmpRec = new Rectangle();
                tmpRec.Fill = Brushes.Black;
                tmpRec.Margin = new Thickness(rand.Next(0, 400), rand.Next(0, 400), 0, 0);
                tmpRec.Width = 40;
                tmpRec.Height = 40;
                tmpRec.Name = "Rec" + i.ToString();
                LRec.Add(tmpRec);
            }
  }