Cascading Dropdown using knockout.js

I am trying to build a three step drop down series. Easiest example I could think of was building a year/make/model drop down set. I have tried following the example at and using another fiddle at (another fiddle url ending with jsfiddle.net/rniemeyer/V2gvT/ ), but am having problems with the databinding. My fiddle has a static list of year/make/model objects to use, and the year list binds properly, but never get the make/model lists to databind. My Fiddle Simple Markup ``` <label for="ddlYear">Year</label> <select id="ddlYear" data-bind="options: years, value: selectedYear"></select> <label for="ddlMake">Make</label> <select id="ddlMake" data-bind="options: makes, value: selectedMake'"></select> <label for="ddlModel">Model</label> <select id="ddlModel" data-bind="options: models"></select> ``` Script ``` var viewModel = { selectedYear: ko.observable(""), selectedMake: ko.observable(""), selectedModel: ko.observable("") }; viewModel.years = ko.dependentObservable(function() { return Enumerable.From(makeModelList).Select(function(it) { return it.year; }).OrderBy(function(it) { return it.year; }).Distinct().ToArray(); }, viewModel); viewModel.makes = ko.dependentObservable(function() { var selectedYear = this.selectedYear(); return Enumerable.From(makeModelList).Where(function(it) { return it.year == selectedYear; }).Select(function(it) { return it.make; }).ToArray(); }, viewModel); viewModel.models = ko.dependentObservable(function() { var selectedYear = this.selectedYear(); var selectedMake = this.selectedMake(); return Enumerable.From(makeModelList).Where(function(it) { return it.year == selectedYear; }).Where(function(it) { return it.make == selectedMake; }).Select(function(it) { return it.model; }).ToArray(); }, viewModel); ko.applyBindings(viewModel); ``` Data is defined in the script block window ``` var makeModelList = [ { year: 1984, make: 'Chevrolet', model: 'Camaro'}, ``` etc. Tried to make it as simple as I could, but can't quite figure out why the selects are databinding like the examples I've tried to mimic.