Selecting a Group Programmatically

I've been trying to use the .net listbar on your site: vbaccelerator.com in my project and I am faced with the following problem:

How to change the current list bar group from code? The Listbarobj.SelectedGroup property is read only. The Listbargroupobj.Selected property is settable but nothing happens when I set it to true.

Any help would be really appreciated.