WPF Layout Control - wpf

Question

I am new to WPF.
I have a wpf window which contains a grid which is dynamic in size along with its columns. This window is supposed to be a small utility type window that is always ontop.
The issue is as the user types into the richtextbox it expands of the bottom of the page, I would like a scroll bar to appear.
I have tried placing it in a container but this doesnt work.
I want the grid to resize if the user decides to resize the window.
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="202" Width="927" WindowStyle="ToolWindow" ShowInTaskbar="True" Topmost="True">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="Auto"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="Auto"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
</Grid.ColumnDefinitions>
<GridSplitter HorizontalAlignment="Right"
VerticalAlignment="Stretch"
ResizeBehavior="PreviousAndNext"
Grid.Column="1"
Width="1"
ResizeDirection="Columns"/>
<GridSplitter HorizontalAlignment="Right"
ResizeBehavior="PreviousAndNext"
VerticalAlignment="Stretch"
Grid.Column="3"
Width="1"
ResizeDirection="Columns"/>
<StackPanel Grid.Column="2" Height="Auto">
<Label Background="SteelBlue" HorizontalAlignment="Stretch" Foreground="white" Height="25">Note</Label>
<RichTextBox ScrollViewer.VerticalScrollBarVisibility="Auto"
ScrollViewer.CanContentScroll="True"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch" >
</RichTextBox>
</StackPanel>
</Grid>
</Window>

Answer 1

Have you tried:
<RichTextBox ScrollViewer.VerticalScrollBarVisibility="Auto"
ScrollViewer.CanContentScroll="True"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
***Height="300">***
</RichTextBox>

Answer 2

StackPanels do not do vertical layout, you should probably either use a DockPanel or a Grid with two Rows instead, that way the RichTextBox is bounded and knows when to use its scrolling functionality.

Answer 3

Thank H.B replacing StackPanel with grid worked. Alex adding the height didnt work sorry.
So I replace the StackPanel with
<Grid Grid.Column="2">
<Grid.RowDefinitions>
<RowDefinition Height="25"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<Label Grid.Row="0" Background="SteelBlue" HorizontalAlignment="Stretch" Foreground="white" Height="25">Note</Label>
<RichTextBox ScrollViewer.VerticalScrollBarVisibility="Auto"
ScrollViewer.CanContentScroll="True"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Grid.Row="1">
</RichTextBox>
</Grid>