forcing scrollbars to appear in listbox - wpf

Question

Hi can I force scrollbars to appear in listbox when its content do not fit. I really need it.
To create tabcontrol item I concucted this xaml:
<TabControl.ContentTemplate>
<DataTemplate>
<ScrollViewer VerticalScrollBarVisibility="Visible"
HorizontalScrollBarVisibility="Visible">
<Grid Name="RssFeedContainerGrid" >
<Grid.RowDefinitions>
<RowDefinition Height="20" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<controls:ucRssFeed Grid.Row="1" RssUri="{Binding FeedUri}" />
</Grid>
</ScrollViewer>
</DataTemplate>
</TabControl.ContentTemplate>
and ucRssFeed contains listbox.
Here some xaml from that control where I want scrolling to take place:
<ListBox.ItemTemplate>
<DataTemplate>
<Grid Margin="10" x:Name="RssFeedCellblock">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="20" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<StackPanel Orientation="Vertical" Margin="10" Grid.Column="1" Grid.ColumnSpan="2" Grid.Row="0">
<!-- Topic label-->
<TextBlock Cursor="Hand" FontWeight="Bold" Text="{Binding XPath=title}" Tag="{Binding XPath=link}" Foreground="{StaticResource RSS_Topic_Title}" MouseDown="TextBlock_MouseDown">
</TextBlock>
<!-- Breakline -->
<Line Stroke="{StaticResource RSS_Topic_Title}" Y1="5" Y2="5" X1="0" X2="{Binding ElementName=NewsListBox, Path=ActualWidth}" Opacity="0.7" StrokeThickness="1"/>
<!-- publication date label -->
<TextBlock Text="{Binding XPath=pubDate}" Opacity="0.5" />
<!-- Description textblock -->
<TextBlock FontSize="10" FontFamily="Times New Roman" x:Name="descriptionTextBlock"
Text="{Binding XPath=description, Converter={StaticResource HtmlToPlainTextConverter}}" Margin="10"
TextWrapping="Wrap" />
</StackPanel>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>

Answer 1

You need to set the Height property of your ListBox for the Scrollbar to appear listbox automatically show scrollbar when the content is more