Not being at all familiar with XAML, I'm trying to get a very simple layout designed where the main page consists of two parts:
- On the left, I want an image that will scale to fit the available height but maintain its aspect ratio.
- On the right, I want a panel that will eventually contain text and controls - at the moment I just have text.
I can get the image to behave ok by using a ViewBox but I can't seem to get the right side of the screen to fill the remaining gap. See screenshot:

What I want is for the area that contains the text to stretch to the right with the text centred within it.
The relevant XAML code is:
<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
<StackPanel Orientation="Horizontal">
<Viewbox HorizontalAlignment="Right">
<Image Source="Assets/ABCImage.png"></Image>
</Viewbox>
<StackPanel Orientation="Vertical">
<TextBlock Text="ABC Viewer"
TextAlignment="Center"
FontSize="48"></TextBlock>
<TextBlock Text="Test application"
TextAlignment="Center"
FontSize="24"></TextBlock>
</StackPanel>
</StackPanel>
</Grid>
This is taking me far too long to figure out. Can someone please put me out of my misery?