Need to select multiple Listbox items

I am trying to test my Silverlight app and I need to select multiple items by both ctl + and shift + . I need to do this programmatically and I can't figure out how to do this. I tried with the recorder to see how it might be done and I see that when I record multiple selections, they play back as single selections. This is a major blocker for my company to accept Telerik testing, so I am trying to figure out what to do about this. I saw a post of bug fixes from some recent drop and I noticed that modifier keys were no longer being recorded. Why would this be removed if it is necessary for basic functionality? Is there another way to accomplish this programmatically? I tried to access the SelectedItems property but it comes back as the datatype (as in the .ToString()) of the backing collection, not as the actual value itself, so I can't set this to get around the single user click.

UPDATE!!!
My mistake. Temporarily forgot the overloads to click that allow for modifier keys. Keys.Control seems to work just fine. No need to responsd with same info.