Cascading Context Menu in Registry Editor

Question

Following a guide, I've been trying to create a cascading menu as a new item in the context menu of a directory.

The item appears in the context menu just fine, however it doesn't open up to list each item as it should and I can't seem to figure out the issue.

The parent item:

Sub Item:

Sub item command:

What exactly am I missing?

Answer 1

Did a little more digging and found that this isn't the way to do it, despite the guide stating otherwise.

After reading this article I found that SubCommands needs to be empty, and then you can add everything as grandchildren.