Can I automatically wrap HierarchicalDataTemplate items inside of a TreeViewItem?

Question

I have a 4-level tree structure, defined by:

<HierarchicalDataTemplate DataType="{x:Type src:Level1}" ItemsSource="{Binding Path=Level2Items}">
    <TextBlock Text="{Binding Path=Level1Name}"/>
</HierarchicalDataTemplate>

<HierarchicalDataTemplate DataType="{x:Type src:Level2}" ItemsSource="{Binding Path=Level3Items}">
    <TextBlock Text="{Binding Path=Level2Name}"/>
</HierarchicalDataTemplate>

<HierarchicalDataTemplate DataType="{x:Type src:Level3}" ItemsSource="{Binding Path=Level4Items}">
    <TextBlock Text="{Binding Path=Level3Name}"/>
</HierarchicalDataTemplate>
<DataTemplate DataType="{x:Type src:Level4}">
    <TextBlock Text="{Binding Path=Level4Name}"/>
</DataTemplate>

And it works great. The only thing is, I can't programmatically select any of my bound items, because they're not of type TreeViewItem (and therefore don't have the "IsSelected" property). Is there a way to automatically wrap databound items in a particular container type (in this case: TreeViewItem)?

Answer 1

If your items are in a TreeView, they'll be wrapped in a TreeViewItem automatically by the TreeView's ItemContainerGenerator. You can do something like this to ensure the IsSelected property on TreeViewItem maps to a property on your data class:

<TreeView>
    <TreeView.ItemContainerStyle>
        <Style TargetType="TreeViewItem">
            <Setter Property="IsSelected" Value="{Binding MyIsSelectedProperty}"/>
        </Style>
    </TreeView.ItemContainerStyle>
</TreeView>

HTH, Kent