TreeView WPF

<TreeView Grid.Row="1" Background="{StaticResource DarkBrush}" ItemsSource="{Binding Block.InnerBlocks}">
    <TreeView.Resources>
        <HierarchicalDataTemplate DataType="{x:Type models:CodeBlock}" ItemsSource="{Binding InnerBlocks}">
            <StackPanel HorizontalAlignment="Stretch" Margin="0 0 0 6">
                <TextBlock Text="{Binding BlockName}" Style="{StaticResource TitleTreeStyle}" />
                <TextBlock Text="{Binding InnerBlocksName}" Style="{StaticResource TitleNumberStyle}" />
            </StackPanel>
        </HierarchicalDataTemplate>
    </TreeView.Resources>
</TreeView>