EP6: How to implement Custom Personalization

I have a class that realises a custom personalization dialog. In EP5 the name of this class had to be specified in the properties file as property PersonalizationClass. I've not found any information how to specify this class in EP6. I tried to specify a property with name="PersonalizationClass" in the component-config part of portalapp.xml but it had no effect.

Can anyone tell me the appropriate syntax or point me to relevant documentation?