TCP collections accessing subclass properties

General
1

I have a group of sockets based on the TCP class, my sockets extend the TCP class by adding a logical property called master

        Dim activeSockets() As TCPSocket
        activeSockets = App.TCPSocket.ActiveConnections
        For Each tcp As myssocket In activeSockets
          if tcp Isa TCPSocket then
             TCPSocket(tcp).SendMessage("Send my message here)
             // TCPSocket(tcp).MASTER is invalid even though the socket I subclass has them
          end if
        Next

My question is , how do I access the master property, as the TCPsocket(tcp) is not my subbed class.
This routine would send data to my custom sockets, but I have no way of figuring out if they are the ones with the master property.
Anyone any ideas.

2

If you only create & use your subclass then just declare the array as an array of your subclass.
Or do you use some of your custom class & some TCP sockets ?