B_FLAT
bool isButton = (flags & B_FLAT) != 0 || (flags & B_HOVER) != 0
if ((flags & B_FLAT) != 0 && (flags & (B_ACTIVATED | B_PARTIALLY_ACTIVATED)) == 0
if ((flags & B_FLAT) != 0
flags &= ~B_FLAT;
flags &= ~B_FLAT;
flags |= BControlLook::B_FLAT;
if ((flags & B_FLAT) != 0
if ((flags & B_FLAT) != 0