How to get notified when user remove a breakpoint from the breakpoint window

I'm a working on a Visual Studio 2013 package. I need to update some information into a custom graphical editor when the user deletes or deactivate a breakpoint in the usual VS breakpoint window during design mode. I have look into the VS available services (http://msdn.microsoft.com/en-us/library/vstudio/bb165789.aspx) and into Dte.debugger (http://msdn.microsoft.com/en-us/library/vstudio/envdte.debugger.aspx) but I can't find any event related to this window.

Any idea how I could do that ?

I could use a pooling to constantly check the current breakpoint list but it's really ugly IMHO.