Use associations in Pluggable Widgets

Hi everyone,       I was trying to build a customized version of a hierarchical grid view. All it should do in the first step is receive a list of entities and turn them into a hierarchy / tree. For this, I need to somewhere specify the association used to check for an elements parent. Unfortunately, I did not find a way to pass associations into a pluggable widget. For dojo widgets you could use the property type “entity” with isPath set to “yes”. However, this option was appearantly removed for pluggable widgets. Did I miss a property type that might help here, or is this simply not possible with pluggabe widgets?   
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