(function() {
    var game = new Phaser.Game(this, 'game', 800, 600, preload, create, null, render);

    var container: Phaser.Group;

    function preload() {
        game.load.spritesheet('button', 'assets/buttons/number-buttons.png', 160, 160);
        
    }
    function create() {
        // Container for sorting the buttons, which we'll use to make buttons
        // to the top later.
        container = game.add.group();

        // Add buttons to container.
        container.add(game.add.button(200, 100, 'button', bringMeToTop, this, 0, 0, 0));
        container.add(game.add.button(300, 100, 'button', bringMeToTop, this, 1, 1, 1));
        container.add(game.add.button(100, 200, 'button', bringMeToTop, this, 2, 2, 2));
        container.add(game.add.button(400, 200, 'button', bringMeToTop, this, 3, 3, 3));
        container.add(game.add.button(300, 300, 'button', bringMeToTop, this, 4, 4, 4));
        container.add(game.add.button(200, 300, 'button', bringMeToTop, this, 5, 5, 5));
    }
    function render() {
        Phaser.DebugUtils.context.fillStyle = '#fff';
        Phaser.DebugUtils.context.fillText('Tap or click buttons to bring it to the top.', 32, 32);
    }
    function bringMeToTop(btn) {
        container.bringToTop(btn);
    }
})();