How to implement a combined presentation for a work item

This article http://jazz.net/library/article/130 on Work Item Editor Presentation show's an example of a
Combined presentations: two presentations (Multi-Select List and Checkbox Multi-Select List) use a string to store the value, but the possible values base on an enumeration.

I've tried to figure out how to do this but the closest I can get is a Radio Button presentation. Is this explained somewhere how this can be done from the Work Item Presentation Editor?

Hmm we did it like this:

Added a new Enumeration
Added some values and icons to the enumeration

Added a custom attribute with type="the name of the enumeration"
Created a presentation on the work item with the attribute and selected type as Enumeration.

This article http://jazz.net/library/article/130 on Work Item Editor Presentation show's an example of a
Combined presentations: two presentations (Multi-Select List and Checkbox Multi-Select List) use a string to store the value, but the possible values base on an enumeration.

I've tried to figure out how to do this but the closest I can get is a Radio Button presentation. Is this explained somewhere how this can be done from the Work Item Presentation Editor?

Hmm we did it like this:

Added a new Enumeration
Added some values and icons to the enumeration

Added a custom attribute with type="the name of the enumeration"
Created a presentation on the work item with the attribute and selected type as Enumeration.

Hmmm When I do that I simply get the single choice list pull down menu. I also do not get the option to choose unassigned. I'm running RTC 2.0.0.2 iFix4 and just experimenting with the JUnit project. Could it be my process template is not at 2.0?