'The menu logo for the default menu, can be:
- a string representing an image URL (can use URL())
- a T()
- an HTML helper instance (e.g. DIV or SPAN)
- None (to show system short name instead of a logo)
NB to override the entire title area, use the template\'s
menus.py and specify a title_area attribute for the
main menu node'

def get_ui_menu_logo(self):

    return self.__lazy('ui', 'menu_logo', URL(c='static', f='img', args=['S3menu_logo.png']))
