Help, how display invalid service

Hi guys, I would like your help to understand how and what to change in 
the code to allow the display (in gray) of the services invalid if they 
have children valid (eg. in NewPhoneTicket).
In OTRS 4.0 it is already so, but in the version that we use (3.0.10) 
service invalid does not appear in the list

many thanks
Rocco

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