I have the following XAML inside a user control of mine to display a barcode. This works fine when the barcode has to be displayed on the application's UI.

<ig:XamCode128Barcode CodeType="Standard"
                      Data="{Binding Sku}"
                      ShowText="True"
                      ErrorMessageText=""
                      BarsFillMode="EnsureEqualSize"
                      UseLayoutRounding="True"
                      Stretch="Uniform"
                      Background="Transparent"/>

This is what get's displayed on the UI:

Ideally I'd use this for printing the barcode as well, but for reasons I don't understand the surrounding code doesn't work.

To avoid this problem I've modified the code so that it creates the barcode in code:

var element = new XamCode128Barcode
{
    Data = item.Sku
    CodeType = Code128CodeType.Standard,
    ShowText = true,
    BarsFillMode = BarsFillMode.EnsureEqualSize,
    UseLayoutRounding = true,
    Stretch = Stretch.Uniform,
    MinHeight = 40,
    MinWidth = 180,
    Foreground = Brushes.Black,
    Background = Brushes.White
};

This works in so far as it displays the barcode. However, it doesn't display the text as shown in this screenshot of a PDF created by the printing code.

The code is correct and scans.

I've tried this with other barcode types and they exhibit the same behaviour.

What am I missing here? Why doesn't the text display? It's not a data binding issue as the "ShowText" property is set explicitly.