Main Menu Group is a typical horizontal menu where all items have a set of 3 images used in Background Image 1, Background Image 2 and Background Tile Image.
Submenu "Sticky Submenus" property is also set to "Sticky" which is the default "sticky" behavior if you leave all other checkboxes empty. Submenu will not disappear unless the user opens another subgroup. Since this menu has only one subgroup, this subgroup will stay open forever.
A "sticky" subgroup can also disappear if the user (1) click somewhere in the page and if (2) hovers another item within the same group. Both of these, are not checked in this example, but you can use them if you need such a menu functionality.
Download this AllWebMenus project file.