Click "Add button" and "Add submenu's item's buttons situated on the Vista Buttons Toolbar to create your menu. You can also use "Delete selected item", "Delete submenu's item" and move buttons.
Create your own buttons or use ready to use Templates.
Select vista button or submenu by clicking it and change button appearance for normal and mouse over states and set buttons/submenus link properties and link target attributes.
Save your menu.
VERTICAL SCROLLING MENU
Let's assign text to the subitems. Select first item in the submenu by clicking it and then enter text in the "Text" field on the Properties toolbox. You will see that, as you enter the text, the selected submenu's text will change too.
Then select next item in the submenu with click. Enter its text and so on. After finishing, the menu will look like this:
Let's change the submenu theme. To do it just select theme you like in the submenus themes list on the Themes toolbox. Then you can browse this theme's submenu backgrounds. Note, that submenu backgrounds are previewable. You can look at their behavior while choosing. Just point mouse at it to know how submenu will react.
When you find a submenu background you like, double-click it to apply. For example, after choosing one of the "blue" theme's backgrounds, we'll get following results:
DESCRIPTION
Use images for backgrounds of submenus and items, icons, arrows. Using web images you can create menus completely based on graphics.
Design both horizontal and vertical menus and submenus with any amount of menus on a single page.
Place any HTML code inside the menu item - be it a flash-object, form, picture, or text. This ability lets you to build various menus of any complexity.
Not a string of code!
You will not need any skills in javascript and html with Drop Down HTML Menu. All programming will be completed for you.
There even will be no necessity to edit your html code to insert a completed button-menu. Just point out the place on your page, where you want the buttons to be, and then press "Insert".
How To's 
Collapsible Tree Menu In Javascript
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