@Override
    public Object @NotNull [] getChildElements(@NotNull Object element) {
      if (element == RootDescriptor.ROOT) {
        return ArrayUtilRt.toStringArray(myCertificates.keySet());
      }
      else if (element instanceof String) {
        return ArrayUtil.toObjectArray(myCertificates.get((String)element));
      }
      return ArrayUtilRt.EMPTY_OBJECT_ARRAY;
    }
@Override
    public Object @NotNull [] getChildElements(@NotNull Object element)