@NotNull
  public IProperty addPropertyAfter(String key, String value, @Nullable IProperty anchor, boolean addToEnd) {
    final XmlTag anchorTag = anchor == null ? null : (XmlTag)anchor.getPsiElement().getNavigationElement();
    final XmlTag rootTag = myFile.getRootTag();
    final XmlTag entry = createPropertyTag(key, value);
    final XmlTag addedEntry = (XmlTag) (anchorTag == null ? myFile.getRootTag().addSubTag(entry, !addToEnd) : rootTag.addAfter(entry, anchorTag));
    return new XmlProperty(addedEntry, this);
  }
@NotNull
  public IProperty addPropertyAfter(String key, String value, @Nullable IProperty anchor, boolean addToEnd)