Remove "Scope to this" from a custom graph node?

Hello,

I've created custom graph nodes using IGraphProvider, and assigned a commands to them by adding them to IDG_VS_CTXT_PROJWIN_FILECONTENTS_SCOPE.

Now when I context-click on that custom item, I get 3 menu items: "Scope to this", my own command, followed by a separator and "New solution explorer view".

Is there a way to remove those?

Thanks!