raw pointer in lua

code(C++):
luabind::object_cast<bool>(m_luaObject["SetAttribute"](m_luaObject, this, strName, strValue));

m_luaObject is  luabind::object type. I call it's SetAttribute method，and pass the second parameter "this" pointer. I had register the class of "this" in the lua.
Now, I want to call some method through "this" pointer in the lua. How can I do it?

code(LUA):
function TextButton:SetAttribute(object, name, value)
         object.InternalFindUIObject("caption") -- "this" pointer, how can I user here?
end


Thanks!
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