I wanted to create a rounded form and I found this page, Creating Smooth Rounded Corners in WinForm Applications.
I used the accepted answer displayed full code and It works, but I found a problem, The text boxes and combo boxes stopped showing their text cursor / caret when I focus them or write in them, I already tried to solve this with other page but I can't find it anymore, I'm making this post as a last resort.
If anyone can help me solve this issue I'm very thankful.