<telerikBarcode:RadBarcode WidthRequest="200"
                           HeightRequest="100"
                           x:Name="barcode"
                           Value="1111111111111"
                           HorizontalOptions="Center">
    <telerikBarcode:RadBarcode.Symbology>
        <telerikBarcode:EAN13 AutoChecksum="False"
                                ShowText="True" 
                                Module="3"
                                SizingMode="Stretch"/>
    </telerikBarcode:RadBarcode.Symbology>
</telerikBarcode:RadBarcode>