Struggling with WinForm menusty

Hide menustrip in child form.

From MSDN How to: Set Up Automatic Menu Merging for MDI Applications

Step 5, Set the Visible property of the target MenuStrip to false.

Otherwise there will be a gap left by this empty menuStrip.

Merge index can’t jump

MSDN How to: Insert a MenuStrip into an MDI Drop-Down Menu (Windows Forms) (MatchOnly for menu (root), and Insert for menu items.)

See the example, no gap between each menu items merge index. No Gap! There is different than PB and VB.

No menustrip inheritance?

MS forces you to use merge menus between mdi parent and child.

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