Does anyone know how to control the display of the tiny little arrow that appears on submenus of JMenu?

Can I change it?
Can I disable it?
Can I move it?

Also, I notice that this arrow doesn't appear on top level JMenus only when they are submenus of other JMenu. This inconsistency annoys me since I have a mix of JMenuItem and JMenu attached to the root of my JMenuBar and so I wish it would always indicate it. Anyway to do this as well?

thanks!