How to set the rootnode as a header in treeview item?

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C#

XAML

hai i am currently using tree view below I have given my treeview code

<TreeView Background="#F9F9F9" BorderBrush="Transparent" VirtualizingStackPanel.IsVirtualizing="True"
           VirtualizingStackPanel.VirtualizationMode="Recycling"  >
           <TreeView.ItemContainerStyle>
               <!--
       This Style binds a TreeViewItem to a PersonViewModel.
       -->
               <Style TargetType="{x:Type TreeViewItem}">
                   <Setter Property="IsExpanded"   Value="{Binding IsExpanded, Mode=TwoWay}" />
                   <Setter Property="IsSelected"  Value="{Binding IsSelected, Mode=TwoWay}" />
                   <Setter Property="Visibility" Value="{Binding Visibility}"/>
                   <Setter Property="FontWeight" Value="Normal" />


                   <Style.Triggers>
                       <Trigger Property="IsSelected" Value="True" >
                           <Setter Property="FontWeight" Value="Bold" />
                       </Trigger>

                   </Style.Triggers>
               </Style>
           </TreeView.ItemContainerStyle>




           <TreeViewItem  Name="FirstTree" ItemsSource="{Binding FirstGeneration}">

               <TreeViewItem.ItemTemplate >


                   <HierarchicalDataTemplate ItemsSource="{Binding Children}"  >
                       <StackPanel Orientation="Horizontal"  >
                           <CheckBox
           Focusable="False"
           IsChecked="{Binding IsChecked}"
           VerticalAlignment="Center"
           />
                           <Image Width="16" Height="16" Margin="3,0" Source="{Binding SystemIcon}" />
                           <TextBlock Text="{Binding Name}"  />
                       </StackPanel>

                   </HierarchicalDataTemplate>
               </TreeViewItem.ItemTemplate>


           </TreeViewItem>

           <Separator BorderBrush="Black" Width="90" BorderThickness="10"/>
           <TreeViewItem  Name="Secondtree" ItemsSource="{Binding SecondGeneration}">

               <TreeViewItem.ItemTemplate >


                   <HierarchicalDataTemplate ItemsSource="{Binding Children}"  >
                       <StackPanel Orientation="Horizontal"  >
                           <CheckBox
           Focusable="False"
           IsChecked="{Binding IsChecked}"
           VerticalAlignment="Center"
           />
                           <Image Width="16" Height="16" Margin="3,0" Source="{Binding SystemIcon}" />
                           <TextBlock Text="{Binding Name}"  />
                       </StackPanel>

                   </HierarchicalDataTemplate>
               </TreeViewItem.ItemTemplate>


           </TreeViewItem>
       </TreeView>

when I use this I got both trees but in both treeitems header is empty if I write any header then inside the header I will get the actual tree. but what I need is if I get root as the XXXX name from that need to start.

What I have tried:

I tried as per what i told in above paragraph.