}
protected ClassTreePortlet createSelectable() {
Optional<Project> prj = ProjectManager.get().getProject(projectId);
if(!prj.isPresent()) {
throw new UnknownProjectException(projectId);
}
ClassTreePortlet treePortlet = new ClassTreePortlet(prj.get(), false, false, false, allowMultipleSelection, topClass);
treePortlet.setDraggable(false);
treePortlet.setClosable(false);
treePortlet.setCollapsible(false);