XAML fixed banner on top of scrollable area - xaml

Question

I'm trying to add a banner that remains fixed in the window to my page and I'm having a tough time.
This is what I am trying to achieve: I want a banner that floats at the top of the window (for an ad), then I want the rest of the content in a scrollable area. First item should be a textBlock, then a textBox, then a button.
This is the code I've got now and it looks right except for the scrolling. Help would be appreciated.
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App2"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:Universal="using:Microsoft.AdMediator.Universal"
x:Class="App2.MainPage"
mc:Ignorable="d" RequestedTheme="Dark">
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<StackPanel Grid.RowSpan="3">
<Universal:AdMediatorControl x:Name="AdMediatorName" Height="90" Id="AdMediator-Id" Margin="10,0"/>
<ScrollViewer x:Name="myScrollViewer" VerticalScrollMode="Enabled">
<StackPanel Grid.RowSpan="2">
<TextBlock x:Name ="outputConsole" FontSize="15" RenderTransformOrigin="0.5,0" TextWrapping="WrapWholeWords" Margin="0,0,10,0" FontFamily="Consolas" IsTextSelectionEnabled="True">
<TextBlock.RenderTransform>
<CompositeTransform/>
</TextBlock.RenderTransform>
<TextBlock.Projection>
<PlaneProjection/>
</TextBlock.Projection>
<Run/>
<LineBreak/>
<Run/>
</TextBlock>
<TextBox x:Name="inputConsole" FontSize="20" KeyUp="inputKeyUp" Margin="0,0,10,0" FontFamily="Consolas" IsTapEnabled="True" IsTextPredictionEnabled="True"/>
<Button x:Name="submitButton" Content="Submit" Click="submitButtonClick"/>
</StackPanel>
</ScrollViewer>
</StackPanel>
</Grid>
</Page>

Answer 1

I figured it out. I just needed to put it directly in the grid. Sorry, still learning XAML.

Answer 2

You just answered your question. You have to do something like this,
<Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<Grid.RowDefinitions>
<RowDefinition Height="50"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<StackPanel Grid.Row="0" Orientation="Horizontal"><TextBlock x:Name ="outputConsole" FontSize="15" RenderTransformOrigin="0.5,0" TextWrapping="WrapWholeWords" Margin="0,0,10,0" FontFamily="Consolas" IsTextSelectionEnabled="True">
<TextBlock.RenderTransform>
<CompositeTransform/>
</TextBlock.RenderTransform>
<TextBlock.Projection>
<PlaneProjection/>
</TextBlock.Projection>
<Run/>
<LineBreak/>
<Run/>
</TextBlock>
<TextBox x:Name="inputConsole" FontSize="20" KeyUp="inputKeyUp" Margin="0,0,10,0" FontFamily="Consolas" IsTapEnabled="True" IsTextPredictionEnabled="True"/>
<Button x:Name="submitButton" Content="Submit" Click="submitButtonClick"/>
</StackPanel>
<ScrollViewer Grid.Row="1">
</ScrollViewer>