How to set image in Tabitem Header for TabcontrolExt?

//Code Explains How to set image in Tabitem header for TabcontrolExt
<Window
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" x:Class="TabcontrolTxt1.MainWindow"
Title="MainWindow" Height="350" Width="525">
<Grid>
<syncfusion:TabControlExt Name="Tabcontrol"  >
<syncfusion:TabItemExt Name="tab1" Header="Tab1" Width="150" Image="Syncfusion.png" ImageWidth="25" ImageHeight="20">
</syncfusion:TabItemExt>
<syncfusion:TabItemExt Header="Tab2"  Image="Syncfusion.png"
 ImageWidth="25" ImageHeight="20">
</syncfusion:TabItemExt>
<syncfusion:TabItemExt Header="Tab3" ></syncfusion:TabItemExt>
<syncfusion:TabItemExt Header="Tab4" ></syncfusion:TabItemExt>
 </syncfusion:TabControlExt>
</Grid>
</Window>
 

//Code Explains How to set image in Tabitem header for TabcontrolExt
namespace TabcontrolTxt1
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
BitmapImage bi3 = new BitmapImage();
bi3.BeginInit();
bi3.UriSource = new Uri("/Syncfusion.png", UriKind.Relative);
bi3.EndInit();
tabitem1.Image = bi3;
  }
  }
  }