How to change return value of builtin function?

I want to change return string value of header function in TerminalMenus package for my menu. How to do it?

For example, i want header to return “test in printed”.

julia> using REPL.TerminalMenus

julia> import REPL.TerminalMenus: header

julia> header(m::RadioMenu) = "test in printed"                                                                                                                               
header (generic function with 4 methods)                                                                                                                                      
                                                                                                                                                                              
julia> options = ["apple", "orange", "grape", "strawberry",                                                                                                                   
                   "blueberry", "peach", "lemon", "lime"];                                                                                                   
                                                                                                                                                                              
julia> menu = RadioMenu(options, pagesize=4);                                                                                                                
                                                                                                                                                                              
julia> choice = request("Choose your favorite fruit:", menu)                                                                                                                  
Choose your favorite fruit:                                                                                                                                                   
test in printed                                                                                                                                                               
   apple                                                                                                                                                                      
 > orange                                                                                                                                                                     
   grape                                                                                                                                                                      
v  strawberry                                                                                                                                                                 
2                                                                                                                                                                             
                                                                                                                                                                              
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