Scrollable canvas containing imges in windows phone 8

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XAML

Windows-Phone-8

Hi,

I am working on a windows phone 8 app. I have a canvas containing images which I can drag to change their position in canvas. My problem is that canvas is not scrollable, I want a vertical scrollbar in page. I tried like this

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<ScrollViewer x:Name="scvImages" HorizontalAlignment="Stretch"
VerticalAlignment="Stretch" Margin="0"
HorizontalContentAlignment="Stretch" Height="Auto" Width="Auto">
<Grid Height="Auto" Width="Auto">
<Canvas x:Name="canImages" Height="Auto" Width="Auto">
</Canvas>
</Grid>
</ScrollViewer>
</Grid>


all this din't work for me .