for (final NavEditorComponent<?> listItem : getEditors()) {
if (listItem instanceof NavEntityArgumentEditor) {
NavEntityArgumentEditor editor = (NavEntityArgumentEditor) listItem;
ArgumentMetadata metadata = editor.getValue();
if (metadata.getDisplayName() != null &&
!LanguageInfo.isValidFunctionName(metadata.getDisplayName())) {
setEditorErrorMessage(editor, NavigatorMessages.getString("NAV_InvalidArgName_Message"));
return false;
} else {