Can't get WPF ScrollViewer to work - wpf

Question

I have a StackPanel and for some reason I can't get the content of the ScrollViewer on the very bottom to be scrollable, despite the fact that the internal height of the Frame clearly exceeds the bounds of the ScrollViewer. I previously had a Grid as the root container of the Window, but when I changed it to StackPanel the scrollbar no longer appears.
The only thing that seems to work is if I explicitly set the height of the ScrollViewer, but then it does not size with thw Window when it's resized.
Do I have to use a Grid?
Sorry if this is obvious; I'm relatively new to WPF.
Thanks in advance for any help!
<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
d:DesignWidth="566" Width="719" >
<StackPanel VerticalAlignment="Stretch" >
<Menu HorizontalAlignment="Stretch" Name="Menu1" VerticalAlignment="Stretch" Width="Auto">
<MenuItem Header="_File" Name="MenuItem1">
<MenuItem Header="_Print" Name="MenuItem2" />
</MenuItem>
</Menu>
<Canvas x:Name="SearchCanvas" Width="681" Height="55">
<ComboBox Canvas.Left="6" Canvas.Top="0" Height="22" x:Name="cbLookupField" Width="302" Text="" SelectedIndex="0">
<ComboBoxItem Content="Reference Name" />
<ComboBoxItem Content="Matter" />
<ComboBoxItem Content="Client Loan Number" />
</ComboBox>
<TextBox KeyDown="tbLookup_KeyDown" Canvas.Left="6" Canvas.Top="28" Height="23" x:Name="tbLookup" Width="302" />
<Button Canvas.Left="314" Canvas.Top="27" Content="Search" Height="24" Name="btnSearch" Width="106" />
<ListView MouseDoubleClick="lvSearchResults_MouseDoubleClick"
ItemsSource="{Binding Tables[0]}"
Canvas.Left="-8" Canvas.Top="57" Height="129" Name="lvSearchResults" Width="697" Visibility="Hidden">
<ListView.View>
<GridView x:Name="gvResultsGridView"/>
</ListView.View>
</ListView>
</Canvas>
<ScrollViewer x:Name="ScrollViewer1" VerticalScrollBarVisibility="Visible">
<Frame Height="Auto" Source="Full Report.xaml" VerticalAlignment="Stretch" x:Name="Frame1" />
</ScrollViewer>
</StackPanel>
</Window>

Answer 1

The ScrollViewer in the bottom does not have a fixed height, and therefore because it's contained in a StackPanel, its height will be the height of the content, which in this case is the Frame height.
You can either set a fixed height for the ScrollViewer, or use a Grid instead of a StackPanel. In case you use a grid you should set a fixed height for the row in which the ScrollViewer will be located.
Hope it helps!