Yes, of course, that's the page I was searching for it, but there are so many of them and I have no clue what 90% of them are. The common sense suggests that if you make a documentation you'd include a small picture of the part those codes refer to...
So for the best of my knowledge, I tried this pair: HP_HEADERITEM and HIS_NORMAL as well as HP_HEADERITEM with HIS_ICONNORMAL and here's what I got for both of them (see screenshot). That doesn't look anything close to it. So what am I doing wrong here?
A follow-up. I got it solved. My mistake was to call OpenThemeData() for a "Button" instead of a "Header". That documentation needs to be updated as well. It's almost like no one uses Windows APIs anymore...
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