This abstract control is from an article by mid=5741 on Code Project from 2008 originally written in .Net 2.0. I needed these controls for another top-secret project and decided to give them a try. Lo and behold, .Net 7 doesn't like .Net 2.0. Go figure. Hence, the time was taken to move things over to .Net 7 and WinForms as well as "modernize" the code for the year 2023.
For a copy of the original CodeProject doc, look no further than here.
The only credit taken by me is the port to .Net 7. All other work is owned by the original author.