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I would have red button (for example). On Linux I use somethink like:
button1.ModifyBg( StateType.Normal, new Gdk.Color(255,0,0) );
and button has normal statetype and red background, but on Windows 7 (both, 32 and 64bit) this command has no efect. Other color options (ModifyFg) also do not work.
This is almost certainly a gtk+ windows port issue. The method you mention is identical on the two platforms from a binding standpoint, which means it's the underlying native code that's most likely not doing what you expect.
You could ask on gtk-app-devel-list perhaps if this is supposed to be supported on windows or if it's a known issue, to determine whether it should be filed against gtk+. They probably won't want to fix it in anything but 3.x at this point though.