Okay, for a moment there, I thought from your original description you were looking for a specific Windows control, of which one doesn't exist as you describe.
Rather, I think what you're describing is what the 'Move Up' and 'Move Down' buttons in the "Rules Wizard" do. In which case, I don't think there is a specific term for that. They just happen to be simple push buttons that grab a handle to the listbox, and change the order of the contents of the listbox through simple listbox function calls.
Other than that, it's obvious I probably won't be very much help in this thread
