how to set the rounded inside corners of a grid in Silverlight 4

I need to set the rounded corners inside the grid control using silverlight 4.

When I tried to do something like this:

<Border BorderThickness="2" Borde开发者_C百科rBrush="#FF3EA9F5" Grid.Row="1" CornerRadius="5,5,0,0" Height="10" VerticalAlignment="Bottom">
   <Grid  x:Name="Phani1" Width="auto"> </Grid>
</Border>

I am able to see rounded corners outside the grid. But I want to grid to appear as a rectangle from outside border. But the inside corners of the grid should appear as rounded.

Please let me know how to do that if anyone had any idea on that.

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The grid will always have square corners but you can assign a Margin="1,1,1,0" to the grid to stop it from overlapping the corners of the border.

<Border BorderThickness="2" BorderBrush="#FF3EA9F5" Grid.Row="1"
    CornerRadius="5,5,0,0" Height="10" VerticalAlignment="Bottom"> 
    <Grid x:Name="Phani1" Margin="1,1,1,0" Width="auto"> </Grid> 
</Border>