cc.Class({
    extends: cc.Layout,

    properties: {

    },  

    _doLayoutDirty: function () {
        this._layoutDirty = true;
        //-----------------------------------------------
        var children = this.node.children;
        for (var i = 0; i < children.length; ++i) {
            var child = children[i];
            child.zIndex=10;
        }
        //-----------------------------------------------
    },

});