How to set icon in WPF DockingManager header?

//How to set flash icon in DockingManagerHeader
<Window x:Class="DockingManagerSetIcon.MainWindow"
                 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                 xmlns:syncfusion="http://schemas.syncfusion.com/wpf"
                 Title="DockingManager Set Icon" Height="350" Width="525" >
      <Grid>
          <Grid.RowDefinitions>
               <RowDefinition Height="*"/>
               <RowDefinition Height="20"/>
          </Grid.RowDefinitions>        
          <syncfusion:DockingManager Name="docking1" UseDocumentContainer="True" >
              <StackPanel syncfusion:DockingManager.Header="Item1" Name="Item1" syncfusion:DockingManager.State="Document">
                  <syncfusion:DockingManager.Icon>
                      <ImageBrush ImageSource="/F101794_DM_SetIcon;component/Icon/App.ico" />
                  </syncfusion:DockingManager.Icon>
              </StackPanel>
              <ContentControl syncfusion:DockingManager.Header="Item2" Name="Item2" syncfusion:DockingManager.State="Document" />
          </syncfusion:DockingManager>
          <Button Content="SetIcon" Click="Button_Click" Grid.Row="1"/>
      </Grid>
</Window>

//How to set flash icon in DockingManagerHeader
namespace DockingManagerSetIcon
{
  public partial class MainWindow : Window
  {
    public MainWindow()
    {
      InitializeComponent();
    }
    private void Button_Click(object sender, RoutedEventArgs e)
    {
       if (docking1.ActiveWindow != null)
       {
          ImageBrush brush=new ImageBrush();
          BitmapImage bi = new BitmapImage();
          StreamResourceInfo sri = Application.GetResourceStream(new Uri(@"Icon/App.ico", UriKind.RelativeOrAbsolute));
          bi.BeginInit();
          bi.StreamSource = sri.Stream;
          bi.EndInit();
          brush.ImageSource = bi;
          DockingManager.SetIcon(docking1.ActiveWindow,brush);
       }
    }
  }
}