Transforming widget “pages” dropdown menu

hello i want a plugin to make a vertical menu, I try to turn the widget “pages” menu, vertical drop can you tell me a quick plugin that can do this to me. I found wp-tree but that does not respond to my needs I want a classic drop-down menu.
Thank you in advance for your help.

Here is what I want but how to install it in wordpress? set to block pages …

http://dosimple.ch/articles/Menus-dynamiques/menuVertical.html