Windows Vista menu is a simulation of the Vista's windows explorer navigation. Some of the basic setting in this menu are:
Main Group Style - Type: Horizontal
Sub Groups Style - Type: Vertical
Main Items Style - Images: Background Image 1, Background Image 2 and Background Tile Image
Main Items Style - Has Submenu Image: Vertical arrow image
Sub Items Style - Has Submenu Image: Horizontal arrow image
The separator lines used between some of the submenu's items are extra items where the separator graphic was inserted as "Background Tile Image" while "Content Padding" is set to zero values, to avoid some undesirable empty spaces and ensure the compact look of the submenu.