private PsiClass getGuessedTagClass() {
      final PsiElement xmlAttribute = myXmlAttributeValue.getParent();
      final XmlTag xmlTag = ((XmlAttribute)xmlAttribute).getParent();
      if (xmlTag == null) return null;
      final PsiElement parentTag = xmlTag.getParent();
      if (parentTag == null) return null;

      String className = null;
      if (parentTag instanceof XmlDocument) {
        className = JavaFxCommonNames.JAVAFX_SCENE_LAYOUT_PANE;
      }
      else if (parentTag.getParent() instanceof XmlDocument) {
        final String name = xmlTag.getName();
        if (!FxmlConstants.FX_BUILT_IN_TAGS.contains(name)) {
          className = JavaFxCommonNames.JAVAFX_SCENE_NODE;
        }
      }
      if (className == null) return null;

      return JavaPsiFacade.getInstance(myAClass.getProject()).findClass(className, GlobalSearchScope.allScope(myAClass.getProject()));
    }
private PsiClass getGuessedTagClass()