@Override
 public void visitXmlAttribute(XmlAttribute attribute) {
   final XmlAttributeDescriptor descriptor = attribute.getDescriptor();
   if (descriptor instanceof JavaFxStaticSetterAttributeDescriptor) {
     final PsiElement declaration = descriptor.getDeclaration();
     if (declaration instanceof PsiMember) {
       appendClassName(((PsiMember) declaration).getContainingClass());
     }
   } else if (descriptor instanceof JavaFxRootTagDescriptor.RootTagTypeAttributeDescriptor) {
     appendClassName(JavaFxPsiUtil.findPsiClass(attribute.getValue(), attribute));
   }
 }
 @Override
 public void invoke(@NotNull Project project, Editor editor, @NotNull PsiElement element)
     throws IncorrectOperationException {
   if (!FileModificationService.getInstance().preparePsiElementsForWrite(element)) return;
   final XmlAttribute attr = (XmlAttribute) element.getParent();
   final String name = attr.getName();
   final XmlAttributeDescriptor descriptor = attr.getDescriptor();
   LOG.assertTrue(descriptor != null);
   String value = attr.getValue();
   final PsiElement declaration = descriptor.getDeclaration();
   if (declaration instanceof PsiField) {
     final PsiType fieldType = ((PsiField) declaration).getType();
     final PsiType itemType =
         JavaGenericsUtil.getCollectionItemType(fieldType, declaration.getResolveScope());
     if (itemType != null) {
       final String typeNode = itemType.getPresentableText();
       JavaFxPsiUtil.insertImportWhenNeeded(
           (XmlFile) attr.getContainingFile(), typeNode, itemType.getCanonicalText());
       final String[] vals = value.split(",");
       value =
           StringUtil.join(
               vals,
               new Function<String, String>() {
                 @Override
                 public String fun(String s) {
                   return "<"
                       + typeNode
                       + " "
                       + FxmlConstants.FX_VALUE
                       + "=\""
                       + s.trim()
                       + "\"/>";
                 }
               },
               "\n");
     }
   }
   final XmlTag childTag =
       XmlElementFactory.getInstance(project)
           .createTagFromText("<" + name + ">" + value + "</" + name + ">");
   attr.getParent().add(childTag);
   attr.delete();
 }