How to remove a shortcut in Visual Studio?

Question

I created a binding for Visual Studio Edit.BriefBookmarkDropx :

• Edit.BriefBookmarkDrop1 : Ctrl + Shift + 1
• Edit.BriefBookmarkDrop2 : Ctrl + Shift + 2
• Edit.BriefBookmarkDrop3 : Ctrl + Shift + 3
  ...
• Edit.BriefBookmarkDrop9 : Ctrl + Shift + 9

Using Tools -> Options -> Keyboard :

Also, when I press Ctrl + Shift + 2 , nothing happens:

I know that Microsoft loves to spoof Visual Studio features. What is the secret trick I miss?

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Note. I install DPack in Visual Studio Professional, an addon that provides short bookmarks (and a number of other essential features). Do not confuse this to answer my question:

• you cannot install add-ons in visual studio express
• you cannot install add-ons in visual studio shell
• My question is not about addons

Reading bonuses

• MSDN: How to Use Bookmarks with Brief Emulation (Visual Studio 2008)
• Numbered Bookmarks for Visual Studio 2005
• Dpak numbered bookmarks

Answer 1

Four years passed, but I realized that. Everything I did was right. The only problem is that Visual Studio is stupid. Here's how to configure Visual Studio to remove the Brief bookmark:

How does this differ from what I showed in the question?

• Cannot Use the new shortcut in: Global
• It works . Use the new shortcut in: Text Editor

By default, any keys that you associate in the Global space do nothing.

What begs the question, why does this parameter exist, and what is the default value? But usability is not something the Visual Studio team is proud of.