dragSources.add(dragSource); namesToComponentsMap.put(((SComponent)dragSource).getName(), dragSource);
if (!dragSources.contains(dragSource)) { dragSources.add(dragSource); namesToComponentsMap.put(((SComponent)dragSource).getName(), dragSource); }
    public void registerDragSource(DragSource dragSource) {        dragSources.add(dragSource);        namesToComponentsMap.put(((SComponent)dragSource).getName(), dragSource);    }