How to set Selected Splitterpage header Background color in TabSplitter?

//Code Explains How to set  selected header Background color in splitterpage
<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="TablSplitet_ActivetabBack.MainWindow"
Title="MainWindow" Height="350" Width="525">
<Grid>
<syncfusion:TabSplitter x:Name="TabSplitter1" SelectedBackground="DarkGreen" MouseOverBackground="Magenta" Foreground="BlueViolet">
<syncfusion:TabSplitterItem Header="tab1" Orientation="Horizontal">
<syncfusion:TabSplitterItem.BottomPanelItems>
<syncfusion:SplitterPage Name="splitterPage1" Header="XAML">
</syncfusion:SplitterPage>
<syncfusion:SplitterPage Name="splitterPage2" Header="XAML1">
</syncfusion:SplitterPage>
</syncfusion:TabSplitterItem.BottomPanelItems>
<syncfusion:TabSplitterItem.TopPanelItems>
<syncfusion:SplitterPage Name="splitterPage3" Header="Top1">
</syncfusion:SplitterPage>
<syncfusion:SplitterPage Name="splitterPage4" Header="Top2">
</syncfusion:SplitterPage>
</syncfusion:TabSplitterItem.TopPanelItems>
</syncfusion:TabSplitterItem>
<syncfusion:TabSplitterItem Header="tab2">
</syncfusion:TabSplitterItem>
</syncfusion:TabSplitter>
</Grid>
</Window>

//Code Explains How to set  selected header Background color in splitterpage
  namespace TablSplitet_ActivetabBack
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
TabSplitter1.SelectedBackground = Brushes.Green;
}
}
   }