dotnet / dotnet/winforms

[Dark Mode] CheckBox/RadioButton text with FlatStyle 'System' is hard to visible after enabled SystemColorMode.Dark

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area-DarkMode help wanted
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Description

### .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: https://github.com/dotnet/winforms/pull/11857

### Issue description

CheckBox/RadioButton text with FlatStyle 'System' is hard to visible after enabled SystemColorMode.Dark

image

### Steps to reproduce

1. Create a WinForms .NET application with RadioButton/CheckBox control, set RadioButton/CheckBox's FlatStyle == System
2. Enable DarkMode by Application.SetColorMode(SystemColorMode.Dark) in Program.cs file
3. Run the application to observe

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