Experimental support for Wyse 60 emulation was added in build 3723.
To enable Wyse 60 emulation capabilities set the Options.TerminalType property of your TerminalControl or VirtualTerminal object to the TerminalType.Wyse60 value.
Also setting the Options.FunctionKeysMode property to the FunctionKeysMode.Wyse60 value is probably needed (depending on the configuration of the remote end).
Please see the following sample code:
// switch to Wyse 60 mode first
terminalControl.Options.TerminalType = TerminalType.Wyse60;
terminalControl.Options.FunctionKeysMode = FunctionKeysMode.Wyse60;
// then bind the TerminalControl (for example) to a telnet client
Telnet client = new Telnet(hostname);
terminalControl.Bind(client);