In 7.5, container pages are now templated implementations instead of system types. You need to add a little config: http://world.episerver.com/Documentation/Items/Upgrading/EPiServer-CMS/75/Breaking-changes/
I read it in the breaking changes but maby my mind was somewhere else....
Got it now, so thanks!
Sometimes I came across an issue that icons really are not shown (for non of the content types). They do show up once again after app pool recycle. I speculate on some cache or similar animal..
Having the same issue as Valdis or kind of. It used to work with registering an interface in the descriptor but doesn't work anymore. Seems to need a concrete class (didn't have the time to ilspy the episerver source). But the moment I remove the interface registration and use a class I get my edit mode icons correct in the tree view.
Valdis, I tried that but no go. Running patch 29 on the site but had the same issue already with patch 27.
We are under upgradering 7.1 to 7.5 for a site and now we noticed that the pages that we use as folders in the tree does not have the foldericon any more.
I might be stupid but I cannot find out how to get the icon back, anyone smarter than me that knows how to do that.