How to display (parent + child) elements content in tree-view in WPF

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XML

WPF

treeview

<FOLDER title="21 00-MAINTENANCE " key="MMEL_N_NP02023" abbr="00">
<ITEM title="TEMP CTL 1(2) MAINTENANCE " key="MMEL_N_00007461">
<TOPIC title="21-00-04 TEMP CTL 1(2) MAINTENANCE " effectivity-group="1">
<reference parameter="DU/00007461.0001001_css.mtd"/>




i want in tree view like

-21 00-MAINTENANCE
-TEMP CTL 1(2) MAINTENANCE
-(21-00-04 TEMP CTL 1(2) MAINTENANCE + DU/00007461.0001001_css.mtd)

What I have tried:

my code :

<HierarchicalDataTemplate DataType="TOPIC" ItemsSource="{Binding XPath=./*}">
<StackPanel Orientation="Horizontal" >

<TextBlock Margin="5,0,0,0" Text="{Binding XPath=@title}" />



<HierarchicalDataTemplate DataType="reference" ItemsSource="{Binding XPath=./*}">
<StackPanel Orientation="Horizontal" >



<TextBlock Margin="5,0,0,0" Text="{Binding XPath=@parameter}" ToolTip="{Binding XPath=@parameter}" Name="txtRef" />