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Hi! You can, but you need to register them through a UI descriptor, like this:
[UIDescriptorRegistration] public class RelatedItemUIDescriptor : UIDescriptor<IRelatedItem> { }
Then AllowedTypes should work. You can also change other types of behavior in the descriptor, please see http://world.episerver.com/documentation/Class-library/?documentId=cms/8/F39A57F.
Hi all i have structre like on the image:

My BaseArticle Page has content are that looks like this:
My question is why i can't use IRelatedItem or IRelatedItemWithColor inside AllowedTypes. Also when i put BaseArticle page, it will work only for SiteA not for SiteB aritlce pages ( i guess this is due to some cache).
I saw in alloy that there is one contentarea that uses allowtypes and IContent is passed as type, so i am wondering what i'm doing wrong ?
Kind Regards
Nemanja