I have the following Grid.
<Grid DockPanel.Dock="Bottom">
<Border HorizontalAlignment="Stretch" VerticalAlignment="Stretch" CornerRadius="4" Background="{DynamicResource {x:Static SystemColors.ControlDarkBrushKey}}">
<Border.RenderTransform>
<TranslateTransform X="2" Y="2" />
</Border.RenderTransform>
<Border.BitmapEffect>
<BlurBitmapEffect Radius="4" />
</Border.BitmapEffect>
</Border>
<Grid Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}">
<Image Source="{Binding Image}"></Image>
</Grid>
</Grid>
It renders like this.

Notice the first one is horizontal while the other is vertical.
How do I tell the Border to be the same size as the inner Grid? This is so that I can match the drop shadow.
I’d try the follows:
Cheers