Other ways to use @DeleteField

The help documentation of @DeleteField only displays one way on its usage:

FIELD fieldName := @DeleteField

But recently while working on an application I found out that there are other ways in which this command can be used.

@SetField("<FIELD NAME>"; @DeleteField);
@SetDocField("<DOCUMENT UNIVERSAL ID>"; "<FIELD NAME>"; @DeleteField)

Would love to hear if you know any other ways to use the command?

Expand / Collapse particular category in a view in XPages

In XPages, you can expand all / collapse all categories in a view either using the expandLevel property of view control or using view control API. The API technique can further be extended to expand / collapse a particular category in a view. So to expand the code goes like this: