I want to help to make gnome-network work on freebsd

Hello.
    I have been using & developing on  linux for 20+ years. Recently I
have installed freebsd on my computer with gnome, but the
network-manager is not working. I googled some and find out
networkmanager can switch to netlink api. So I think i can work this
these to make networkmanager applet work on freebsd gnome.
   I am not sure why they are disabled. The gnome looks a bit
different. Can anyone guide where I can start?
   Thanks