[Wxlua-users] Multiple Lua instances in multi-threading app

Hello,
I'd like to use wxLua in a multi-threading application, several threads should host their own Lua instance.
The Lua instances should run independent from the others, not sharing anything.
So I create a wxLuaState object for every thread and use RunFile to execute the script.

But: I also want to use own functions (published through RegisterFunction) and I can't manage to get them independent.
I would have to declare them in a global scope (or as static member functions), both would lead to a common function 
implementation which is called from all threads. But I want to have them separate, to avoid any interference between the Lua threads.

Can anybody give me a hint how to do this?

Yours,
Helmut