How to view the PDF pages as thumbnail view in WPF PDFViewer?

int thumbnailZoomFactor = 4;
private void Window_Loaded(object sender, RoutedEventArgs e)
{
  //Loads the document in PdfViewerControl
  PdfViewer.Load(@"..\..\Data\HTTP Succinctly.pdf");
  ThumbnailGrid.Background = new SolidColorBrush(System.Windows.Media.Color.FromRgb(((int)(((byte)(237)))), ((int)(((byte)(237)))), ((int)(((byte)(237))))));
  PdfViewer.DocumentLoaded += PdfViewer_DocumentLoaded;
            
}
 
/// <summary>
/// Event triggered once the document has been loaded
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
private void PdfViewer_DocumentLoaded(object sender, EventArgs args)
{
  ThumbnailGrid.RowDefinitions.Clear();            
  ExportAsImage();
}
 
/// <summary>
/// Convert the PDF pages into images
/// </summary>
private async void ExportAsImage()
{
  int count = PdfViewer.LoadedDocument.Pages.Count;
  float height = PdfViewer.LoadedDocument.Pages[0].Size.Height / thumbnailZoomFactor;
  float width = PdfViewer.LoadedDocument.Pages[0].Size.Width / thumbnailZoomFactor;
  ParentGrid.ColumnDefinitions[0].Width = new GridLength(width + 30);
  for (int i=0;i< PdfViewer.LoadedDocument.Pages.Count;i++)
  {
     RowDefinition row = new RowDefinition();
     row.Height = new GridLength(height+5);
     ThumbnailGrid.RowDefinitions.Add(row);
     Bitmap bitMap = new Bitmap(await Task.Run(() => PdfViewer.LoadedDocument.ExportAsImage(i)), (int)width,(int)height);
     var memory = new MemoryStream();
     bitMap.Save(memory, ImageFormat.Png);
     memory.Position = 0;
     BitmapImage bitmapImage=new BitmapImage();
     bitmapImage.BeginInit();
     bitmapImage.StreamSource = memory;
     bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
     bitmapImage.EndInit();
     bitmapImage.Freeze();
     System.Windows.Controls.Image image = new System.Windows.Controls.Image()
     {
       Source = bitmapImage
     };
     image.Height = height;
     image.Width = width;
     image.MouseUp += Image_MouseUp;
     Grid.SetRow(image, i);
     ThumbnailGrid.Children.Add(image);
               
  }            
}
 
/// <summary>
/// Event triggered once click the thumbnail images
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Image_MouseUp(object sender, MouseButtonEventArgs e)
{
  System.Windows.Controls.Image img = sender as System.Windows.Controls.Image;
  int pageNumber = (int)img.GetValue(Grid.RowProperty);
  PdfViewer.GoToPageAtIndex(pageNumber+1);
} 

<Window x:Class="SampleWPF.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:SampleWPF"
        mc:Ignorable="d"
        xmlns:Syncfusion="clr-namespace:Syncfusion.Windows.PdfViewer;assembly=Syncfusion.PdfViewer.WPF"
        Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded">
    <Grid x:Name="ParentGrid"  >
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="103*"></ColumnDefinition>
            <ColumnDefinition Width="414*"></ColumnDefinition>
 
        </Grid.ColumnDefinitions>
        <Syncfusion:PdfViewerControl Grid.Column="1" x:Name="PdfViewer" />
        <ScrollViewer  Grid.Column="0">
             <Grid  x:Name="ThumbnailGrid" ScrollViewer.VerticalScrollBarVisibility="Visible" >        
             </Grid>
          </ScrollViewer>
    </Grid>
</Window>