I have one big rectangle with a vertical line in the middle. At the right and at the left i have other rectangle (invisible). I can drag another object in both sides but i want to know where I have added it (wether at right or left). Both right and left sides are linked to the same kind of class (one of my metamodel called Graph) so I cannot get information from it (no name or something similar to distinguish).
is it possible to establish some Tag or Name to the containers or rectangles so i can access to them when I am adding and see where I am doing it? Or is there another option?