The ComboBox have the BackColor after setting DropDownStyle as DropDownList in NET11 mode

[Zheng-Li01]

.NET version

.NET 11.0.0-rc.1.26413.103 + Private dlls built from main branch of dotnet/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 #14809

Issue description

The ComboBox have the backcolor after setting DropDownStyle as DropDownList in NET11 mode

Steps to reproduce

1. Extract & build the attached project
2. Observe the BackColor for the comboxbox with DropDownStyle as DropDownList in NET11 mode
   VerifyCombobox.zip

[KlausLoeffelmann]

Is this the same as #14908 ?