function ChildCollectionViewModel() {
var self = this;

self.CollectionElements = ko.observableArray([]);

// data-bound to a button that adds a new element
self.addCollectionElement = function () {
    self.CollectionElements.push(new CollectionElement());
};

// data-bound to a button that removes the current element
self.removeCollectionElement = function (collectionElement) {
    self.CollectionElements.destroy(collectionElement);
};

function CollectionElement() {
var self = this;

self.Id = ko.observable();
self.Prop1 = ko.observable();
self.Prop2 = ko.observable();
self.Prop3 = ko.observable();
}}