Adding a folder to a book

Hi,

I am trying to add a folder to an empty book, which I have as the ActiveBook. This does not work:

#target framemaker

var book = app.ActiveBook;
var folder = book.NewBookComponentOfTypeInHierarchy ("Widget Guide", Constants.FV_BK_FOLDER);

Anyone else been able to add a folder to a book? There is an FDK 11 sample showing how to do it with the FDK, but I can't find any ExtendScript examples.

If there are any Adobe engineers reading this, please help! I am trying to help a paying customer (Microsoft) that wants to switch to FrameMaker. Thanks.

Rick