Here a little update:
I changed all the SysColors zu $FF000001 and all Colors to $FF000100 then exported a list to see if these color values are used elsewhere. And yes they are...
Not the colors from the Colors tree, but from the SysColors-Tree. So I changes all "not found" colors to 000101,000102,000103,000104... and so on.
Then I compared the to exports:
So here is an update of the used SysColors:
EditStyle Selection-BrushColor and other selections using the clHighlight Color and for Focus. Like in Grids.
The ListView is perhaps (not in the Styleviewer) using the clWindow Color for Background and ItemBackground (not confirmed). And the TEllipse is using clBtnText for Fill-Color - strange - also not confirmed.