Fancy curvy shadow style for a ContentControl

ShadowBorder.xaml

		<Style x:Key="ShadowBorder" TargetType="ContentControl">
			<Setter Property="Foreground" Value="#FF000000"/>
			<Setter Property="HorizontalContentAlignment" Value="Left"/>
			<Setter Property="VerticalContentAlignment" Value="Top"/>
			<Setter Property="Template">
				<Setter.Value>
					<ControlTemplate TargetType="ContentControl">
						<Grid HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}">
					    	<Grid Margin="2,1,2,-3" RenderTransformOrigin="0.5,0">
					    		<Grid.RenderTransform>
					    			<CompositeTransform ScaleY="1.03" ScaleX="1.02"/>
					    		</Grid.RenderTransform>
					    		<Grid.RowDefinitions>
					    			<RowDefinition/>
					    			<RowDefinition Height="15"/>
					    		</Grid.RowDefinitions>
					    		<Grid.Effect>
					    			<BlurEffect Radius="10"/>
					    		</Grid.Effect>
					    		<Rectangle Fill="{TemplateBinding BorderBrush}"/>
					    		<Path Data="M0,0 L10,0 L10,10 C8.333333,9.333333 7.3667073,8 5,8 C2.6332927,8 1.6666666,9.333333 0,10 z" Fill="{TemplateBinding BorderBrush}" Stretch="Fill" UseLayoutRounding="False" RenderTransformOrigin="0.5,0" Grid.Row="1"/>
					    	</Grid>
					    	<ContentPresenter Cursor="{TemplateBinding Cursor}" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}"/>
					    </Grid>						
					</ControlTemplate>
				</Setter.Value>
			</Setter>
		</Style>