All sub-elements add a shadow

demand:

All the elements required for a page (a child) add shadows, particularly an irregular shape, such as a rounded border

 

<Border Background="#ffffff">
        <Grid>
            <Grid.Effect>
                <DropShadowEffect Color="#C7C7C7" BlurRadius="10" ShadowDepth="0"></DropShadowEffect>
            </Grid.Effect>
          <Border Background="#ffffff" Width="10" Height="50"></Border>
          <Border Background="#ffffff" Width="10" Height="50"></Border>
        </Grid>
</Border>