src/webui/app/frameworks/roles-tree-root.html

<div ng-click="toggle('')" ng-class="visible[''] ? 'tree-expanded': 'tree-collapsed'">
  <div class="tree-internal">
    {{ roles.length }} roles
  </div>
</div>

<ng-include ng-if="visible['']" src="'app/frameworks/roles-tree.html'"></ng-include>