Error window popup when removing a TabPage containing a DataGridView in DemoConsole application

[Syareel-Sukeri]

.NET version

main branch 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+?

Reproduced on the release/9.0 branch.

Issue description

When a TabPage containing a DataGridView is removed from a TabControl in the WinForms designer, an error message appears stating: Error invoking 'Remove Tab'. Details: Designer is not initialized

DGVinTabPage.mp4

Steps to reproduce

1. Open the test sample: DemoConsole in Winforms repo.
2. Switch to the TabControl and TableLayoutPanel tabpage and drag the DataGridView control in the lower right corner onto one of the TabPage .
3. Attempt to remove the TabPage by opening the smart tag and click "Remove Tab".

More Info:

1. The issue cannot be reproduced with any other controls in TabControl and TableLayoutPanel tabpage

[merriemcgaw]

@Syareel-Sukeri - does this also occur when you remove the offending tab by using the CollectionEditor?
@LeafShi1 can your team investigate what might be causing this?

[Syareel-Sukeri]

@merriemcgaw Yes, the issue still reproduces when removing the TabPage using the Collection Editor with same 'Designer is not initialized' error appears.

12899RemoveCollection.mp4