Block Toolbar choice programmatically in ArcMap 10.1

[TeoD_Smyrni]

With an extension I can block ArcMap's Customize menu using following code line:
  
>  ArcMap.Application.LockCustomization("password");

But, it makes no sense since by right-click on Toolbar docking area, user still can add any toolbar he wants. Is there a way to block that right click menu too?

[TeoD_Smyrni]

Turns out it can be done using ICustomizationFilter, but functionality is broken in 10 and 10.1, [ fixed in 10.2.1 ]. Known as issue NIM092574.