UI Element Stereotypes and Diagrams

[tomte]

Hello, in the Help system I found a page "Screen" telling
"a 'screen' is a stereotyped class representing a User Interface screen"

and a Page "User Interface Group" telling
"The User Interface Group enables you to create graphical user interface diagrams".

I saw both diagram examples showing UI forms.
I found a stereotype "combobox" at one of the UI elements, but vice versa giving a class this stereotype had no effect.

Both screens in the diagram do not have the stereotype "screen", but their association has a type "screen".

Did anybody experiment with UI diagrams via stereotypes? Maybe with
- a list of supported UI stereotypes
- where / how to provide UI stereotypes
- a little example?

Thank you in advance.

Best regards
Thomas