The above controller is exclusivity of ACG server, what run a kind of online campaign in weekends.
In ATAG server you can use the in game "Control" - typing this controls:
TAB > 7 > 4 = select a dispatch (Radar station) and ask for contacts.
Previously are used TAB > 7 > 1 - "Inform nearest contact", but this was more a AWACS than a Radar, very harmful for bombers.