Group now extends PIXI.DisplayObjectContainer, rather than owning a _container property, which makes life a whole lot easier re: nesting.

examples/wip/misc/nested groups.js

@@ -0,0 +1,41 @@
+
+var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser-example', { preload: preload, create: create, update: update });
+
+function preload() {
+
+    game.load.image('ball', 'assets/sprites/pangball.png');    
+	game.load.image('arrow', 'assets/sprites/asteroids_ship.png');
+
+}
+
+var ballsGroup;
+var shipsGroup;
+
+function create() {
+
+	ballsGroup = game.add.group();
+	shipsGroup = game.add.group();
+
+	for (var i = 0; i < 20; i++)
+	{
+		//	Create some randomly placed sprites in both Groups
+		ballsGroup.create(game.rnd.integerInRange(0, 128), game.world.randomY, 'ball');
+		shipsGroup.create(game.rnd.integerInRange(0, 128), game.world.randomY, 'arrow');
+	}
+
+	//	Now make the ships group a child of the balls group - so anything that happens to the balls group
+	//	will happen to the ships group too
+	ballsGroup.add(shipsGroup);
+
+}
+
+function update() {
+
+	ballsGroup.x += 0.1;
+
+	//	Because shipsGroup is a child of ballsGroup it has already been moved 0.1px by the line above
+	//	So the following line of code will make it appear to move twice as fast as ballsGroup
+	shipsGroup.x += 0.1;
+
+}
+