Outlook style Tree with numbers on right-hand-side

I was looking for a control that supported Outlook or Mac style, that has the count of items in the “folder” out to the right (for example, number of unread emails in the inbox), an accordion or tree would probably work for me.

Does a control already exist or needs to be added somehow to an existing control?


Like the attached image. Anybody?

You could probably do that with
with some styling.