How to display vertical scroll in radrichtextbox

[york]

Hi,
I have a radtabcontrol in which each tabitem contains a radrichtextbox. The code:

<Grid x:Name="LayoutRoot">
     <telerik:RadTabControl>
         <telerik:RadTabItem>
              <Grid>
                 <telerik:RadRichTextBox Grid.Row="1" HorizontalAlignment="Stretch" IsContextMenuEnabled="True" IsSelectionMiniToolBarEnabled="True" IsSpellCheckingEnabled="True" LayoutMode="Paged" Margin="0" Name="radRichTextBox2" VerticalAlignment="Stretch" />
        ......

But the radrichtextbox does not show a vertical scroll even if it can be scrolled. I want to know how to display vertical scroll. Thanks.

[york]

This is solved.