Changing it to this has the desired effect
<!-- Vertical scrolling item list -->
<ListView
x:Name="itemListView"
AutomationProperties.AutomationId="ItemsListView"
AutomationProperties.Name="Items"
TabIndex="1"
Grid.Row="1"
Margin="0,0,0,0"
Padding="120,0,0,60"
ItemsSource="{Binding Source={StaticResource itemsViewSource}}"
IsSwipeEnabled="False"
SelectionChanged="ItemListView_SelectionChanged">
<ListView.ItemTemplate>
<DataTemplate>
<Grid Margin="6">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Image Source="{Binding ImagePathSmall}" Stretch="None" AutomationProperties.Name="{Binding Priority}" />
<StackPanel Grid.Column="1" Margin="10,0,0,0">
<TextBlock Text="{Binding Category}" Style="{StaticResource TitleTextBlockStyle}" TextWrapping="NoWrap" MaxHeight="40"/>
<TextBlock Text="{Binding Patient}" Style="{StaticResource CaptionTextBlockStyle}" TextWrapping="NoWrap"/>
</StackPanel>
</Grid>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<!-- Details for selected item -->
<ContentControl x:Name="itemDetail" Content="{Binding SelectedItem, ElementName=itemListView}" Grid.Row="1" Grid.Column="1" >
<ContentControl.ContentTemplate>
<DataTemplate>
<Grid x:Name="itemDetailGrid" Margin="0,60,0,50">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Image Source="{Binding ImagePath}" Stretch="UniformToFill" AutomationProperties.Name="{Binding Priority}" Width="128" Height="128"/>
<StackPanel x:Name="itemDetailTitlePanel" Grid.Row="1" Grid.Column="1">
<TextBlock x:Name="itemTitle" Margin="0,-10,0,0" Text="{Binding Category}" Style="{StaticResource SubheaderTextBlockStyle}"/>
<TextBlock x:Name="itemSubtitle" Margin="0,0,0,20" Text="{Binding Patient}" Style="{StaticResource SubtitleTextBlockStyle}"/>
</StackPanel>
<TextBlock Grid.Row="2" Grid.ColumnSpan="2" Margin="0,20,0,0" Text="{Binding TaskDetails}" Style="{StaticResource BodyTextBlockStyle}"/>
</Grid>
</DataTemplate>
</ContentControl.ContentTemplate>
<ContentControl.ContentTransitions>
<TransitionCollection>
<ContentThemeTransition HorizontalOffset="100"/>
</TransitionCollection>
</ContentControl.ContentTransitions>
</ContentControl>