[Zope] Accessing Control_Panel from DTML?

I'm trying to access Control_Panel from within a DTML Method, but it refuses to acknowledge the existence of Control_Panel... <dtml-with Control_Panel> <dtml-with "_.Control_Panel"> <dtml-with "this().Control_Panel"> Hints? Not possible? I can access other items in the app (root) folder, no problems. Richard