PropertyGrid exposes VisualStylesModeChanged event although VisualStylesMode is hidden

[Olina-Zhang]

.NET version

.NET 11.0.100-preview.7.26365.114 + Private dlls built from Net11/Integration-4 branch of https://github.com/KlausLoeffelmann/winforms repo

Did it work in .NET Framework?

Not tested/verified

Did it work in any of the earlier releases of .NET Core or .NET 5+?

Not support, new feature of #14792

Issue description

PropertyGrid hides the VisualStylesMode property, but the corresponding VisualStylesModeChanged event is still exposed in the Events window.

Since PropertyGrid explicitly hides VisualStylesMode (Browsable(false)) and always reports VisualStylesMode.Classic, exposing the VisualStylesModeChanged event is inconsistent and may confuse developers.

Steps to reproduce

1. Create a WinForms (.NET 11) project.
2. Add a PropertyGrid control to the Form.
3. Select the PropertyGrid in the Designer.
4. Verify that the VisualStylesMode property is not shown in the Properties window.
5. Switch to the Events view to observe.

[KlausLoeffelmann]

Wow - @Olina-Zhang - AMAZING find!! Thanks!
@LeafShi1 - thanks for addressing this!

[Olina-Zhang]

Tested in the latest .NET 11 RC1 build: 11.0.100-rc.1.26379.102, it was fixed with PropertyGrid's VisualStylesModeChanged event hidden