ExpanderView Control Header Scrollable Properties

Question

hi,
 i hav an expanderView control. the contents of the expander view scroll vertically along with the header. but i want to know if there is a possibility where the header remains unscrolled and the contents only scroll..!!

<ScrollViewer Width="Auto" HorizontalScrollBarVisibility="Visible" VerticalScrollBarVisibility="Disabled">

<toolkit:ExpanderView Width="1800"

Expanded="btnExpand_Click"

Header="{Binding TaskName, Mode=TwoWay}"

x:Name="taskNameExpander" Margin="5,10,5,10" Foreground="#FF677389" FontSize="24" VerticalAlignment="Top" HorizontalAlignment="Left"

ItemsSource="{Binding dateTime}" ItemTemplate="{StaticResource CustomItemTemplate}">

<Image Name="toggleButton" Source="/SpliceM;component/Images/D.png" Height="54" Width="60" Margin="-220,-45,0,10" Grid.Row="1" Grid.Column="0" ></Image>

</toolkit:ExpanderView.Expander>-->

<!--<toolkit:ExpanderView.Expander>

<toolkit:ExpanderView.ItemsPanel>

<ItemsPanelTemplate >

<StackPanel Orientation="Horizontal" Width="Auto" ScrollViewer.HorizontalScrollBarVisibility="Visible" ScrollViewer.VerticalScrollBarVisibility="Disabled"/>

</ItemsPanelTemplate>

</toolkit:ExpanderView.ItemsPanel>

</toolkit:ExpanderView>

</ScrollViewer>