An error dialog pops up after clicking Add button in ToolStripItem Collection Editor

• .NET Core Version: 5.0.100-preview.5.20226.6

• Have you experienced this same bug with .NET Framework?: No

Problem description: An error dialog is occurring after clicking the Add button.

Expected behavior: The items can be added successfully without any error/warning popping up.

More info:

1. This issue also can reproduce with BindingNavigator/ContextMenuStrip/MenuStrip/StatusStrip/ToolStrip controls
2. This issue also can reproduce with .Net Core 3.1.

Minimal repro:

1. Create a winforms core project.
2. Add a propertyGrid control to form.
3. Add a MenuStrip control to form.
4. Add this code in form initializeComponent part: propertyGrid1.SelectedObject = menuStrip1;
5. Find the Items property of MenuStrip, click the Browser button to show the ToolStripItem Collection Editor.
6. Click the Add button.

Or

1. Run the attached project. System.ToolStripItem.zip
2. Run it, and do the above step 5-6.

[merriemcgaw]

@lonitra feel free to add a PR for this fix 😁

[msftbot[bot]]

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