I have a perplexing problem that makes no sense to me - I am trying to place a border round an image control in WPF. The image control displays an image perfectly (I have loaded through code behind and XAML and both work fine). However when I place a border around the image control the image does not appear at all. This happening with three image controls all with identical config. Does anyone know why this is or how I can fix it? Many thanks, Jeff. 

XAML (with border commented out) is below:

```
<!--<Border BorderBrush="Black" BorderThickness="2" Margin="201,172,618,450" Grid.Column="1">-->
                    <Image Name="imgFault11" Stretch="Fill" Grid.Column="1" Margin="200,172,619,450">

                <!--</Border>-->

```