Rewriting / Extending WPF TreeView

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To get multiple levels you need to tell the treeview how to deal with the data.

Thats done by the hierarchicaldatatemplate.  You're probably best googling it but below is an example I had to hand.  It's showing Units which in turn can have subunits which contain units... which can have subunits and so on.

This also illustrates how you template different types because a subunit is displayed different from a unit.

<TreeView Name="tvBuilt" Grid.Row="0" Grid.Column="0" 
            ItemsSource="{Binding}" 
            TreeViewItem.Selected="OnItemSelected"><TreeView.ItemContainerStyle><Style><Setter Property="TreeViewItem.IsExpanded" Value="True"/></Style></TreeView.ItemContainerStyle><TreeView.Resources><HierarchicalDataTemplate
          ItemsSource="{Binding Path=Unit.SubUnits}"
          DataType="{x:Type local:SubUnit}"><TextBlock><Run Text="{Binding Unit.Name}" /><Run Text="{Binding Path=SubType, StringFormat= : {0}}" /> <Run><Run.Text><MultiBinding StringFormat="{} : {0}/{1}"><Binding Path="Unit.UnitCost" /><Binding Path="Unit.MemberCost" /> </MultiBinding></Run.Text></Run> </TextBlock> </HierarchicalDataTemplate><HierarchicalDataTemplate 
          ItemsSource="{Binding Path=SubUnits}"
          DataType="{x:Type local:Unit}"><StackPanel Orientation="Horizontal"><TextBlock><Run Text="{Binding Path=Name}" /></TextBlock></StackPanel></HierarchicalDataTemplate></TreeView.Resources><TreeView.CommandBindings><CommandBinding
            Command="ApplicationCommands.Delete" 
            Executed="DeleteExecuted"
            CanExecute="CanDelete"/></TreeView.CommandBindings> <TreeView.ContextMenu><ContextMenu><MenuItem Header="Delete" Command="Delete" InputGestureText=" "
            CommandTarget="{Binding Path=PlacementTarget, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContextMenu}}}"/></ContextMenu></TreeView.ContextMenu></TreeView>