How to set ToolTip of TDI Window header in Document Container

//Code Explains how to set the tooltip of tab for DocumentContainer
<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="DocumentContainer1.MainWindow"
Title="MainWindow" Height="350" Width="525">
<Grid>
<syncfusion:DocumentContainer Name="Documentcontainer1" Mode="TDI">
<ContentControl Name="tab1" syncfusion:DocumentContainer.Header="Tab1"  syncfusion:DocumentContainer.TabCaptionToolTip="TabToolTip1">
</ContentControl>
<ContentControl Name="tab2" syncfusion:DocumentContainer.Header="Tab2" syncfusion:DocumentContainer.TabCaptionToolTip="TabToolTip2">
</ContentControl>
</syncfusion:DocumentContainer>
</Grid>
</Window>

//Code Explains how to set the tooltip of tab for DocumentContainer
namespace DocumentContainer1
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DocumentContainer.SetTabCaptionToolTip(tab1, "TabToolTip1");
DocumentContainer.SetTabCaptionToolTip(tab2, "TabToolTip2");
}
}
}