I've implemented the solution as described on http://world.episerver.com/blogs/Per-Magne-Skuseth/Dates/2015/11/trying-out-propertylistt/
Does anyone know how to override the rendering of the items in the list in All Properties view? I have a ContentReference property in my poco-class which only shows the ID:
An EditorDescriptor only affects the popup for adding/editing:
I'd like to render the ContentReference as a thumbnail.
You need to override PropertyList editor and change the code responsible for renderring ContentReferences.
Here is the source code code thumbnail preview - Gist
And a blog post that describe how to use this code.
Works great, thanks for sharing Grzegorz