I always found the best way (though ghetto) is to jump away from the current screean (MAX_EA perhaps) then back. It's been a while since I've looked at the SDK however, perhaps there are better ways now.
// Request a refresh of a builtin window:
// mask is a combination of IWID_... constants
inline void request_refresh(int mask)
{
dirty_infos |= mask;
}
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