>Don't know if you've solved you MenuStrip problem yet but

Yes, I solved it. As you may notice in source code I posted there was missing MainMenuStrip assignment in parent form which causes the issue.


>>3. I need to merge Toolstrip buttons also. Will Toolstrip button merging
>>work in the same way as menu merging ? Can I remove child toolstrip by
>>setting its visible propery to false ?
>
>I've just been looking at this. Firstly the automatic merge doesn't work with ToolStrips - you have to use the ToolStripManager.Merge() method. Having said that I can get it working successfully in a simple test scenario but *not* in my actual application - I'm having the same problem with the ToolStrip that you are/were having with the MenuStrip (but my MenuStrips are merging OK).

I used code in mdi child activate event from the forum link I posted to you to merge my Toolstrips.
I havent tested it a lot but my initial tests show that this work OK.

>
>I'll let you know if I solve this - the problems may be related...

My biggest issue is that MenuStrip and ToolStrip merging are not supported in MONO. So in MONO duplicate menus and toolstrips appear.