[VisualStylesMode: Net11] ComboBox becomes corrupted when switching between VisualStylesMode.Classic and VisualStylesMode.Net11

[Amy-Li03]

.NET version

.NET 11.0.100-preview.7.26365.114 + Private dlls built from Net11/Integration-3 branch of https://github.com/KlausLoeffelmann/winforms repo

Did it work in .NET Framework?

Yes

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

Not support, new feature

Issue description

A ComboBox may render incorrectly after switching between VisualStylesMode.Classic and VisualStylesMode.Net11 in design time.
The issue is not observed when the application starts directly in either mode

Steps to reproduce

1. Create a WinForms .NET application
2. Set VisualStylesMode to Net11.
3. Add a ComboBox to form designer
4. Switch to VisualStylesMode.Classic
5. Observe the ComboBox rendering.

[Amy-Li03]

Tested the fix in .NET 11/Integration-4 branch, issue was fixed, ComboBox rendered correctly when switching between different VisualStylesMode.