[ORD R2 10.10.20.04] Thematic Display Style in Features DGNLIB

Can someone explain to me why the Thematic Display Style that is set in a feature definition element template needs to be stored in the features dgnlib, and not stored in the display styles dgnlib that holds all my other display styles?

Is this by design or is this a defect?

Thanks,

Gerald Piotrowski