case ADD:
blackboard.removeCoordinate( bag.shape.getNumPoints()-1, bag.coords.get(0), bag.shape );
break;
case REMOVE:
if( runAnimation )
AnimationUpdater.runTimer(handler.getContext().getMapDisplay(), new AddVertexAnimation(bag.p.getX(), bag.p.getY()));
blackboard.insertCoords(bag.index, bag.p, bag.coords, bag.shape);
blackboard.selectionAdd(bag.p);
break;
default: