We are planning to add support for collection initializers:
case=27194
Anyway, what feature do you exactly miss? Listboxes works for me:
Do you get the same result with the above test code? If listboxes don't work the way you see on the screenshot for you: what version of the IDE and Visual Assist are you using?
OK, thanks. Like I said we have a case for this, thus will improve it later, but the listbox itself seems to work for me, so I just wanted to help you to get the maximum out of the current state. So if it doesn't work for you, I may be able to help to make it work. Starting from a simple test case like the above can help to see what type of problem are you seeing.