Just a short note to myself, what we need for options binding, so that it can work properly. 

<select autowidth="true" data-bind="
	options: $root.carTypes
	,optionsValue: 'carValue'
	,value: myTest

Where myTest is like:

function CarsView(initialValues) {
	var self = this;	
	self.myTest = ko.observable(initialValues);

If we need model to pass, then model should look like:

carsModel = 
			carTypes: ko.observable('Ferrari'),
			myTest: ko.observable('Ferrari')

Not finished example you can see here.