no shadow for raster groups

HTML

<script src="http://cdn.eyahuska.com/paper-full.min.js"></script>
<canvas resize='true' id="mycanvas"></canvas>
<script type="text/paperscript" canvas="mycanvas">
var raster = new Raster({
	source: 'http://upload.wikimedia.org/wikipedia/en/2/24/Lenna.png',
	position: view.center
});

var circle = new Path.Circle({
    position:view.center,
	radius: 100
});

var circle2 = new Path.Circle({
    position:view.center,
	radius: 98,
	shadowColor: new Color(0, 0, 0),
	fillColor: 'black',
    shadowBlur: 25,
});

group = new Group ([circle,raster]);
group.clipped = true;

///////////////////second set 

var raster2 = new Raster({
	source: 'http://upload.wikimedia.org/wikipedia/en/2/24/Lenna.png',
	position: view.center-200
});
raster.strokeColor = 'black';
raster.strokeWidth = 200;
// Create a circle shaped path at { x: 80, y: 50 }
// with a radius of 35:
var circle3 = new Path.Circle({
    position:view.center-200,
	radius: 100
});

group2 = new Group ([circle3,raster2]);
group2.clipped = true;
group2.strokeColor = 'black';
group2.strokeWidth = 200;
</script>