Hi VL,
this is a nice feature, thanks for the reply. I would like something like this, but more
dynamic. That's is not to show the hidden related elements permanently, but just for a moment and per one mouse click only.
E.g. when a developer is viewing the diagram, she wants to 1. click the element, immediately see, what hidden related elements are and optionally 2. click the hidden related element to see it's properties or view it in the Project Browser. It's implemented in the "Relationship" window already, but IMHO not user friendly if the developer wants to click more than 10 elements in the diagram

Anyway, thanks for your hint, it's an alternative to the "Relationship" window.