page.setDebug(debugPane);
final DebugString debug = new DebugString();
final AuthenticationSession authenticationSession = IsisContext.getAuthenticationSession();
debug.appendTitle("Session");
if (authenticationSession != null) {
debug.appendln("user", authenticationSession.getUserName());
debug.appendln("roles", authenticationSession.getRoles());
} else {
debug.appendln("none");