expando.html

<div class="panel panel-default">
    <div class="panel-heading">
        <h4 class="panel-title">
            <a href="javascript:void(0)" data-bind="collapse: { expanded: expanded }, click: toggleExpanded">
                <span data-bind="text: heading"></span>
                <i class="fa pull-right" data-bind="css: expandedIconClass"></i>
            </a>
        </h4>
    </div>

    <div class="panel-collapse" data-bind="template: { nodes: $componentTemplateNodes }">
    </div>
</div>