_MakeButtonGradient
void _MakeButtonGradient(BGradientLinear& gradient,
_MakeButtonGradient(fillGradient, rect, base, flags, orientation);
_MakeButtonGradient(fillGradient, rect, indicatorBase, flags);
void _MakeButtonGradient(BGradientLinear& gradient,
_MakeButtonGradient(fillGradient, rect, base, flags, orientation);
_MakeButtonGradient(fillGradient, rect, indicatorBase, flags);