Recursive itemtemplateselector for Treeview in WPF

Question

(Level-1)
Scalar ---value
Enum  ---value
String ---Value
Boolean ---value
Array
    (Level-2)
    -Array  
        (Level-3)
        -Scalar ---value
        -Enum  ---value
        -String ---Value
        -Boolean ---value
    -Scalar ---value
    -Enum  ---value
    -String ---Value
    -Boolean ---value

I have to display a treeview as shown in above tree. The level 1 items are enum,scalar,boolean,string,Array object. I have written templateSelector to select different template for each level 1 objects. I am able to write data template for level 1 types. But how to write template for "Array Type" because it again contains level 1 items as its items(level-2). same issue for level-3. Only 3 level are allowed.

<local:ParameterTemplateSelector x:Key="ParameterTemplateSelector"></local:ParameterTemplateSelector>
    <DataTemplate x:Key="ScalarTemplate">
        <StackPanel Orientation="Horizontal">
            <Label FontWeight="Bold" Width="80" Content="{Binding parameterCode}"></Label>
            <TextBox Text="{Binding Value.Item.Value}" Width="100" TextAlignment="Center"></TextBox>
        </StackPanel>
    </DataTemplate>
    <DataTemplate x:Key="EnumTemplate">
        <StackPanel Orientation="Horizontal">
            <Label FontWeight="Bold" Width="80" Content="{Binding parameterCode}"></Label>
            <TextBox Text="{Binding Value.Item.Value}" Width="100" TextAlignment="Center"></TextBox>
        </StackPanel>
    </DataTemplate>
    <DataTemplate x:Key="StringTemplate">
        <StackPanel Orientation="Horizontal">
            <Label FontWeight="Bold" Width="80" Content="{Binding parameterCode}"></Label>
            <TextBox Text="{Binding Value.Item}" Width="100" TextAlignment="Center"></TextBox>
        </StackPanel>
    </DataTemplate>
    <DataTemplate x:Key="BooleanTemplate">
        <StackPanel Orientation="Horizontal">
            <Label FontWeight="Bold" Width="80" Content="{Binding parameterCode}"></Label>

            <ComboBox Width="100" SelectedIndex="{Binding Value.Item, Converter={StaticResource boolToIndexConverter}}">
                <ComboBoxItem Tag="1">True</ComboBoxItem>
                <ComboBoxItem Tag="0">False</ComboBoxItem>
            </ComboBox>
            <!--<TextBox Text="{Binding Value.Item}" Width="100" TextAlignment="Center"></TextBox>-->
        </StackPanel>
    </DataTemplate>