silverstripe-blog/templates/SilverStripe/Blog/Forms/BlogAdminSidebar_holder.ss

<div class="cms-content-tools east cms-panel cms-panel-layout blog-admin-sidebar<% if $isOpen %> open<% end_if %>"
	 data-expandOnClick="true"
	 data-layout-type="border"
	 id="blog-admin-sidebar">
	<div class="cms-panel-content center">
		<div class="cms-content-view cms-tree-view-sidebar" id="blog-admin-content">
			<h3 class="cms-panel-header">$Title</h3>
			<% loop $Children %>
				$FieldHolder
			<% end_loop %>
		</div>
	</div>
	<div class="cms-panel-content-collapsed">
		<h3 class="cms-panel-header">$Title</h3>
	</div>
	<div class="cms-panel-toggle south">
		<a class="toggle-expand" href="#"><span>&laquo;</span></a>
		<a class="toggle-collapse" href="#"><span>&raquo;</span></a>
	</div>
</div>