DemoConsole app: Unexpected warning pops up when clicking 'Edit Items...' command link for ListBox in Properties window

[Olina-Zhang]

.NET version

main branch of Winforms repo

Did it work in .NET Framework?

Yes

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

No, still repro in Release/9.0 branch when ListBox was added in DemoConsole app, no this control in DemoConsole app on Release/8.0 branch

Issue description

In DemoConsole test app of WinForms repo, unexpected warning pops up when clicking 'Edit Items...' command link for ListBox in Properties window

Expected Result: for clicking Items property

In .NET framework 4.8.1 for DemoConsole app, there hasn't 'Edit Items...' command link for ListBox in Properties window

Steps to reproduce

Test the sample app: DemoConsole in Winforms repo, go to TabControl and TableLayoutPanel page to find ListBox control