Picking overlapping instance from same family

Hiya,

I have a situation where I am drag and dropping an item belonging to family to an another object belonging to that same family. Now what I'd need is to set attribute of the object I am dragging to point at object I am dragging it to. As you might have guessed, I am having problem selecting between these two instances.

Any smooth way to achieve this?

Anyone? I'll try to describe my situation more:

I have two boats. Dragging one on top of other should give it the order to attack that other ship. Like I said, picking the correct instance UID is problem in this case as both are from same family and same object type.

In your case, the easy way out is to store the instance id of the ship you are dragging as a variable and pick it during the event.