I've been making a GUI for an R package with gWidgets and gWidgetstcltk and have just finished it, on Windows it's looks fairly normal - Windows 7 style look of buttons etc, but on the Mac it does not look native - it's all grey and square in it's style. Is there something I can do on my Macintosh to enable a native look - once when I built the package in RStudio it appeared native but after that it never did it again (I made no settings change etc) - I've made no explicit effort to change how it looks on any system since I'm not sure where I would even start - hence the question. I'm using R 3.x.x presently. I have XQuartz on my mac.
Thanks,
B. Ward