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Call lua function with "Swiged" parameter... How to ?

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Hello everybody,

I'm currently using SWIG 2.0 to allow various classes of my application to be accessible from Lua.
Everything is working fine, and really, SWIG is a GREAT tool but ... i'm facing a problem:

I have a swiged class "CMyClass".
And i want to call a lua function let's say:

function OnPostInfoRequest( myclass )
print( myclass.AFunctionOfCMyClass() )

At first i thought it would be enought to use lua_pushlightuserdata and to call the OnPostInfoRequest(), but apparently that's not the case.
If i just do that, when the statement myclass.AFunctionOfCMyClass() is executed, i have a lua error that say that myclass does not have any metatable associated ...
Does anybody know how to achieve that ?
Should i use the SWIG_lua function [font=monospace][size=2]SWIG_NewPointerObj ?[/font]
[font=monospace][size=2]Any help is welcome !![/font]

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C++ code will look like:

myclass * my_class_ptr;
lua_State *L;
lua_getglobal(L, "OnPostInfoRequest");

SWIG_NewPointerObj(L, my_class_ptr, SWIG_TypeQuery(L, "myclass*"), 0);

lua_pcall(L, 2, 1, 0) ;

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