DemoConsole app: The SmartTag dialog doesn't disappear when switch the Tabpage items

[Zheng-Li01]

.NET version

The latest main branch & release/11.0-preview5 of 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+?

The issue does not reproduce on release/11.0-preview4 & release/10.0 & release/8.0 & release/9.0 branch of winforms repro

Issue description

Actual Results:
The SmartTag dialog doesn't disappear when switch the Tabpage items

Actual11.mp4

Expected Results:
The SmartTag dialog disappeared when switch the Tabpage items

Expected10.mp4

Steps to reproduce

Test sample: DemoConsole in Winforms repo

1. Build & run the DemoConsole app
2. Open the SmartTag dialog for any controls, such as TreeView
3. Click the Edit Nodes... items to open the TreeNode Editor dialog
4. Closed the TreeNode Editor dialog
5. Switch the TabPages to observe the SmartTag dialog for the TreeView

[LeafShi1]

The regression introduced by #14491

[Olina-Zhang]

Verified in the latest main branch of Winforms repo, it was fixed: SmartTag window will disappear when focusing on other places:

GH14600_fixed.mp4

[Zheng-Li01]

Verified in the release/11.0-preview6 branch of Winforms repo, it was fixed that have the same results as above.