Getting feedback from the VS Properties Window

Hi, I'm developing a custom editor for a specific file extension.

The editor is similar to the windows forms editor. What I need is to get feedback from the Properties Window when a property changes on the selected object.

I'm using ITrackSelection service to set the object in the Property Window. I'm using VS 2010.

I've already searched for this, but I simply can't find the answer.

Here's a similar post (it's old and it's unanswered that's why I'm creating a new one).

http://social.msdn.microsoft.com/Forums/vstudio/en-US/05147010-aaa6-4533-a5e4-0c898be49c86/monitoring-changes-in-the-properties-window

Thanks!