Is there a way to hook to Saving event of the PageType and/or Property on PageType in Admin mode?
Well, the EPiServer.DataFactory.Instance object exposes events for you to use. Have a look at this blog post:http://labs.episerver.com/en/Blogs/Allan/Dates/112230/3/When-and-Where-to-attach-DataFactory-Event-Handlers/
Mari, thanx for the answer. What I need is for the same thing as you proposed but for PageType saving, not Page saving.
Wooops, read your question too quickly - oh, well it's friday. ;-)
Do not know of an event for hooking into the PageType saving, sorry.
EPiServer.DataAbstraction.PageType as the event PageTypedSaved you can hook into.