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constructor
(new menu% [label label] [parent parent] [ [help-string help-string] [demand-callback demand-callback]]) → (is-a?/c menu%) label : label-string? 
parent : 
(or/c (is-a?/c menu%) (is-a?/c popup-menu%) (is-a?/c menu-bar%)) help-string : (or/c label-string? #f) = #f 
demand-callback : ((is-a?/c menu%) . -> . any) = (lambda (m) (void)) 
Creates a new menu with the given label.
If label contains a & or tab characters, they are handled specially in the same way as for menu-item labels and buttons. See set-label and button%.
If help-string is not #f, the menu has a help string. See get-help-string for more information.
The demand-callback procedure is called by the default
on-demand method with the object itself.