Problem to derive a base class in C++ or in Lua

Hello Everyone
I'm writing to you because i've just tryied to use LuaBind, and i get a few basic things working : binding a function, binding a basic class. But i can't derive a class. To be more precise I can't derive in Lua a class defined in C++ ; and I can't even derive in Lua a class defined also in Lua. My C++ and Lua code is below

As I'm a complete beginner with LuaBind, I suppose my mistake is obvious, but I don't see it.

I'm using MSVC++ 9.0 on windows Vista. I've put in my project folder the lua and luabind include file. I've also put luabind source file. I link with lua51.dll.

Thanks in advance for your help

my C++ code is : 

extern "C" { 
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
}
#include "luabind/luabind.hpp"
#include 
using namespace luabind;
using namespace std;
int main() { 
lua_State *myLuaState = lua_open();
luaL_openlibs(myLuaState);
open(myLuaState);
int retLua = luaL_dofile(myLuaState,".\\Test.lua"); 
if (retLua !=0) { 
cout << "erreur dans l'éxécution LUA :"<< retLua << endl; 
}
lua_close(myLuaState);
return 0; 
}

my Lua code is : 

class 'lua_testclass'
function lua_testclass:__init(name)
self.name = name
end
function lua_testclass:print()
print(self.name)
end
a = lua_testclass('example')
a:print()
　
class 'derived' (lua_testclass)
function derived:__init() super('derived name')
end
function derived:print()
print('Derived:print() -> ')
lua_testclass.print(self)
end
b = derived('derived example')
b:print()

In this code, if b is a lua_testclass, there is no error.

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