public void createDependency(GraphicNode startNode,GraphicNode endNode) throws InvalidAssociationException{
DependencyService service=DependencyService.getInstance();
HasDependencies startObject=(HasDependencies)startNode.getNode().getImpl();
HasDependencies endObject=(HasDependencies)endNode.getNode().getImpl();
//try {
Dependency dep=service.newDependency(startObject,endObject,DependencyType.FS,0L,this);
//} catch (InvalidAssociationException e) {
// e.printStackTrace();
//}
}
// public void createHierarchyDependency(GraphicNode startNode,GraphicNode endNode){