I have a EntityDisplay class that contains 2 properties:

public ICollection Collection { get; private set; }

public string CollectionName { get; private set; }

Some times Collection will be a simple List<string>, but sometimes it will be a List<List<int>.

I currently have it working for simple lists, but can not find a way to do it for nested lists.

This is my xaml at the moment. It works for simple Lists, but does not work for nested ones.

<Grid x:Uid="Grid_4">

    <TreeView x:Uid="TreeView_2"
              Background="Transparent"
              BorderThickness="0"
              Padding="0">

        <TreeViewItem x:Uid="TreeViewItem_1"
                      Header="{Binding CollectionName}">

            <ListBox x:Uid="ListBox_2" MouseDoubleClick="TreeViewItem_MouseDoubleClick"
                     ItemsSource="{Binding Collection}"
                     Background="Transparent"
                     BorderThickness="0">
            </ListBox>

        </TreeViewItem>

    </TreeView>
</Grid>

Simple list working with the xaml

For nested lists, I get the tree view header and expandable option, but instead of showing me the list as the first screenshot, it gives me (Collection).
Nested list currently