Rounding corners of scatterview item - Microsoft surface SDK

Question

I have an image overlaid on the scatterview item. The scatterview item contains stackpanel and few textblocks. On overlaying and putting the main window's background as transparent, I can still see the corners which do not gel well with the image.

I am using surfaceusercontrol to add surface items in scatterview. The code is below:

<s:SurfaceUserControl x:Class="Models.ModelItemControl"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:s="http://schemas.microsoft.com/surface/2008" Width="110" Background="Transparent">

  <Grid>
    <Grid.Background>
      <ImageBrush ImageSource="pack://application:,,,/Resources/models_card_150-01.png" Opacity="1.0" Stretch="Fill" />
    </Grid.Background>
    <Viewbox >
    <StackPanel MaxWidth="250" MinHeight="300">
    <TextBlock Name="ItemTitle" Margin="5,5,5,5" TextWrapping="Wrap" Visibility="Visible" Padding="2" />
    <Image Name="ItemImage" Margin="5,5,5,5"  Visibility="Visible" MaxHeight="100"/>
    <TextBlock Name="ItemDesc"  Margin="5,5,5,0" TextWrapping="Wrap" Visibility="Visible" Padding="2" />
    <s:SurfaceToggleButton Checked="ItemInfo_Checked" Unchecked="ItemInfo_Unchecked" Margin="5,0,5,0" HorizontalAlignment="Center" VerticalAlignment="Center">Display more info</s:SurfaceToggleButton>
    </StackPanel>
    </Viewbox>
    </Grid>
</s:SurfaceUserControl>

I want a method to clip the corners to round shape instead of rectangular.

Answer 1

Had posted on MSDN also, the link to the answer is posted below:

Rounding corners of scatterview item-MSDN Forums