I did a video on Youtube that explains exactly what I want to do, but I can put it here because I dont have permission
How do I reposition all intances on grid?
Descrition:
1 - Click on btn "+" to create a new instance on grid;
2 - Each instance has an name ("A", "B", "C"...etc...);
3 - Click any instance to destroy it;
4 - All instances are repositioned on grid.