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

examples/wip/misc/group extends.js

@@ -0,0 +1,47 @@
+
+//  Here is a custom group with a property 'key'
+//  This isn't required, it's just an example of a custom group level property. Only 'game' is required.
+MonsterGroup = function (game, key) {
+
+    Phaser.Group.call(this, game);
+
+    this.key = key;
+
+};
+
+MonsterGroup.prototype = Object.create(Phaser.Group.prototype);
+MonsterGroup.prototype.constructor = MonsterGroup;
+
+/**
+ * Generate some monsters on request, all spaced out evenly
+ */
+MonsterGroup.prototype.make = function(qty, x, y) {
+
+    for (var i = 0; i < qty; i++)
+    {
+        this.create(x, y, this.key);
+        x += 64;
+    }
+
+}
+
+//  Boilerplate code below
+
+var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser-example', { preload: preload, create: create });
+
+function preload() {
+
+    game.load.image('bunny', 'assets/sprites/bunny.png');
+    game.load.image('ball', 'assets/sprites/shinyball.png');
+
+}
+
+function create() {
+
+    var monsters = new MonsterGroup(game, 'bunny');
+    var balls = new MonsterGroup(game, 'ball');
+
+    monsters.make(6, 100, 100);
+    balls.make(10, 64, 500);
+
+}