[Dark Mode] ToolTip is not in dark mode after enabled SystemColorMode.Dark

[Olina-Zhang]

.NET version

9.0.0-rc.1.24418.2 + private dlls built 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

ToolTip is not in dark mode after enabled SystemColorMode.Dark

Steps to reproduce

1. Create a WinForms .NET application with checkBox and toolTip controls
2. Find the ToolTip on toolTip1 property of checkBox, then set some text for this property
3. Enable DarkMode by Application.SetColorMode(SystemColorMode.Dark) in Program.cs file
4. Run application, tab or mouse over this checkBox to observe the keyboard tooltip or mouse tooltip

[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!