Is it possible to add a relation without drawing it?

According to the discussions on this forum (and to some attempts I made), it seems to be impossible to add any kind of relation between two elements from the model explorer.

I hope I missed something, as it should not be mandatory to draw something to model it (the model should define its representations/diagrams, not the other way around), even if it can be deleted/hidden right afterwards…

If such a feature exists, could someone be kind enough to explain me how to use it? (If not, is this planned for a next release of VP?)

Best regards,

Currently, you cannot draw message without drawing in diagram.