I'm using Sharepoint Object Model and after spending some hours with this problem, it looks like SPLimitedWebPartManager doesn't have the "Zones" property (available in SPWebPartManager). I cannot believe the SPLimitedWebPartManager is able to retrieve all the webparts on a specific page (an SPFile), each one with its respective webpartzone assigned, and not able to retrieve all the webparzones of that file!
Any ideas?
Thanks in advance!
Nuno