My previous suggestion may not have worked out:
IUP - GUI for LUA. Here are some more.
murgaLua - new and currently being developed
wxLua - cross-platform, popular, lot's of resources. Even includes
DLLs to be used as a
Lua Module.
LuaWin - favorite option, impliments Win32 GUI API, seems to be untouched for awhile, I emailed the developer and I am currently waiting a response.
Any Thoughts?