// here are actually panels on the NavigationToolBar. Clean this up.
CollaborationSection collabSection = CollaborationSection.create(
new CollaborationSection.View(res), participantModel, appContext);
treeNodeMoveController = new FileTreeNodeMoveController(
appContext, fileTreeSection.getFileTreeUiController(), fileTreeModel);
OutlineSection outlineSection = OutlineSection.create(
new OutlineSection.View(res), appContext, outlineModel,
editorBundle.getOutlineController());