I never noticed that the direction of LV windows is reversed, but that's probably because I work on an English OS and we mandate the same for most of the systems we deploy. I expect that Windows allows apps to override the system default when creating windows and that this is what LV does. I don't know if there are API calls which would allow you to modify that and I wouldn't recommend calling them even if they do exist.
In any case, if I were you I would be worried less about that and more about how the text is going to look when it has non-RTL content in it and what to do if you want to let users enter their own text. In my experience that's the real problem.
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