if("default".equalsIgnoreCase(subTag.getName())) {
XmlAttribute xmlAttr = subTag.getAttribute("key");
if(xmlAttr != null && "_controller".equals(xmlAttr.getValue())) {
String actionName = subTag.getValue().getTrimmedText();
if(StringUtils.isNotBlank(actionName)) {
Method method = ControllerIndex.getControllerMethod(xmlTag.getProject(), actionName);
if(method != null) {
NavigationGutterIconBuilder<PsiElement> builder = NavigationGutterIconBuilder.create(Symfony2Icons.TWIG_CONTROLLER_LINE_MARKER).
setTargets(method).
setTooltipText("Navigate to action");