Loni Tra

@woefulpines could you update PR with feedback addressed so we can take this to completion? Let me know if there are any concerns :)

Thank you @woefulpines for starting on this work! https://github.com/dotnet/winforms/pull/11441 has built off of your PR and addressed changes, so I will be closing this one. Please feel free to continue...

@KlausLoeffelmann could you take an initial look at this?

@kirsan31 Do you think you could provide consistent repro for us to investigate this?

Changes LGTM, In regard to previous conversation: > > In this image -  > > the column border is not visible between the column headers. Could you please open...

@elachlan, @gpetrou, @paul1956, @kirsan31, @weltkante If you have time and haven't already, we'd love to hear your feedback! (:

Appreciate your patience here @paul1956! @KlausLoeffelmann is preparing for BUILD talk this week, but will take a look at your PRs afterwards

One form of test coverage that we are lacking is test coverage against existing ActiveX controls such as Microsoft Web Browser, System Monitor Control, etc. Any additional coverage here would...