Smart tag panel of ToolStripContainer does not open in DemoConsole application

[Philip-Wang01]

.NET version

.Net 9.0: 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+?

Yes, it works well in #9750 Verification result.

Issue description

In DemoConsole test app of Winforms repo, Smart tag panel of ToolStripContainer does not open.

Actual result in DemoConsole application when testing main branch:

Expected result in DemoConsole application when testing in #9750:

Steps to reproduce

Test sample: DemoConsole in Winforms repo

[Philip-Wang01]

Verified this issue from main branch of winforms repo, the smart tag panel of ToolStripContainer can be opened in DemoConsole application.