[Dark Mode] The BackColor of the ProgressBar control should not be changed

[MandiMan]

.NET version

9.0.100-rc.1.24418.2 + build private dll from winforms repo main branch

Did it work in .NET Framework?

No

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

This is a new feature Dark Mode: #11857

Issue description

In Dark Mode, the BackColor of the ProgressBar control will change to red when its BackColor property is set to red
The BackColor of the ProgressBar will not be changed in Classic Mode

Dark Mode

Classic Mode

Steps to reproduce

1. Create a WinForms .NET Core application with ProgressBar control
2. Enable DarkMode by Application.SetColorMode(SystemColorMode.Dark) in Program.cs file
3. Set the BackColor property of the ProgressBar to red
4. Run the application

[dotnet-policy-service]

This issue is now marked as "help wanted", and we’re looking for a community volunteer to work on this issue. If we receive no interest in 180 days, we will close the issue. To learn more about how we handle feature requests, please see our documentation.

Happy Coding!