WPF Layout Control

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"><开发者_开发百科;/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>

Have you tried:

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

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.

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>