Custom projects and IVSMDPropertyGrid availability

Hi all,

I'd like to access VS's Property Window somehow so that I can refresh it, etc., which I assume uses PropertyGrid under the hood.  I'm making another assumption that VS exposes IVSMDPropertyGrid somehow for the Property Window. GetService(typeof(IVSMDPropertyGrid)) in my package returns null unfortunately. What's the best way to get to that?

I'd appreciate any insight. Thanks in advance.