How the visual studio manages its menu and toolbars?

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When I open a Xml file with VS2015,there are some menu items visible, but when I open a .cs file some other menu items are visible. How the vs complete it?
What is the mechanism?

What I have tried:

as if the vs used a thread to manage the menu items,but I am not sure.

Posted 30-Aug-16 4:42am

codeprojectddx

Updated 30-Aug-16 7:19am

Leo Chapiro

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Leo Chapiro 30-Aug-16 10:51am

What shall be a problem to assemble the menu items dynamically dependent on context?
What have you not understood here?

Richard MacCutchan 30-Aug-16 11:59am

This is fairly standard with most modern applications. When the user clicks on a menu, the application builds the menu dynamically depending on the current context.

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johannesnestler · Accepted Answer · 2016-08-30T07:19:00

You didn't mention any specif UI tech to do that...
But you can do that easily in any C#-UI tech I know. You can create/add/delete/modify menu-items with code at runtime.
If you use e.g. WPF/XAML you will use bindings on the ui-side, but even if you use not UI-Tech specific MVVM-ViewModels you can change the model that represents your MenuItems dynamically.
So I can just guess you did only create menus with a designer (e.g. WinForms-Designer)and never looked at the code (Markup) that is produced? Hard to imagine what could be your problem - can you eleborate a little what you don't "understand" about a dynamic menu mechanism? (there are no dumb questions!)
You mentioned "threads" - I see no relation from the underlaying problem of a dynamic menu to multithreading...