http://stackoverflow.com/questions/41941319/toggling-expand-collapse-button-for-a-knockout-table-sub-table

by jlspake

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.1/knockout-min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<div>
  <h4 data-bind="text: Title"></h4>
</div>

JavaScript

var viewModel = function(){
	var self = this;
  self.Title = ko.observable("Hello World");
}

ko.applyBindings(new viewModel());