package usecases;
import authoring.environment.InstanceManager;
import authoring.environment.TowerEditor;

public class AddTower {

	public void addTower(){
		String partName = InstanceManager.getPartType(new TowerEditor().getClass());
		InstanceManager.addPart(partName);
	}
}

@@ -246,16 +246,49 @@
 eManager
+ im = new InstanceManager();%0A%09%09im
 .addPart

use case fixed