combobox- transperant

Hi,

Sorry is Iam posting for the second time. I could not view the question that
i 've posted. Hence Iam forced to post as new thread.

Please let me know how can I achieve the following:
1. Transperancy in the look of combo box when the list items were dropped.
I've inspired to do this by looking at the address bar of IE in windows
vista. I tried using "Opacity" but couldnot generate the required result.
2. The listview of IE in Windows vista to be reporduced to use in windows
forms so that it look just like a browser page. This concept is also been
inspired by IE in windows vista. I believe its a treeview but need info as
how to achieve it.

Thanks in advance.