Silverlight Scrollviewer Mousewheel scrolls only when scrolled on datagrid. Page doesn't scroll when scrolled outside the datagrid

Silverlight Scrollviewer Mousewheel scrolls only when scrolled on datagrid. Page doesn't scroll when scrolled outside the datagrid

Page scrolls without any issue when the mouse is over data grid. If the mouse outside datagrid page doesn't scroll.

<navigation:Page> <Grid x:Name="LayoutRoot" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">      <ScrollViewer x:Name="scrollMainQueue" VerticalScrollBarVisibility="Auto" >         <StackPanel>             <StackPanel>             </StackPanel>             .......             <StackPanel>                 <data:DataGrid AutoGenerateColumns="False" Name="grdWorkingDocs" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" MinHeight="50" Margin="5,0,5,5" CanUserResizeColumns="False" CanUserReorderColumns="False" LoadingRow="grdWorkingDocs_LoadingRow" AlternatingRowBackground="White" RowBackground="White" HorizontalGridLinesBrush="White" HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Disabled" />             </StackPanel>             </StackPanel>             ......                       </StackPanel>     </ScrollViewer> </Grid> 

scrollMainQueue.SetIsMouseWheelScrollingEnabled(true);

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