A problem calling a function using Con::executef()

I'm having a problem calling a Torquescript function from C++ using Con::executef().

I started with a function in script:
function Login_AddLobby( %lobbyName ) { ... }

and called it from C++ using:
Con::executef(Login, 2, "Login_AddLobby", itr->GetName().c_str());


This works fine. However, I wanted to create a Login namespace, so I changed the function to:
function Login::AddLobby( %lobbyName ) { ... }

and the C++ call to:
Con::executef(Login, 2, "Login::AddLobby", itr->GetName().c_str());

And now in script, I get the error: "Login::AddLobby: Unknown command."

So, I was wondering how I would go about calling my function from C++ using executef (if it's possible).

Thanks!

-Steve